MTGMss907.xml Guide to the Milltown Dam Collection 1906-2007 Milltown Dam Collection Finding aid prepared by Patrick Swart Maureen and Mike Mansfield Library, The University of Montana--Missoula 2018
Missoula, MT 59812 406-243-2053 http://www.lib.umt.edu/asc library.archives@umontana.edu
Finding aid encoded by Donna McCrea 2018 Finding aid written in English.Finding aid based on DACS ( Describing Archives: A Content Standard). University of Montana, Mansfield Library, Archives and Special Collections
The University of Montana—Missoula Missoula, MT 59812 406-243-2053 http://www.lib.umt.edu/asc library.archives@umontana.edu
Mss 907 Milltown Dam Collection 1906-2007 19.75 linear feet The Milltown Dam was a hydroelectric dam located seven miles east of Missoula, Montana, at the confluence of the Clark Fork River and Blackfoot River near Milltown and Bonner, Montana. This collection contains records from a variety of sources documenting the dam's operation and impact from 1906-2006. The dam was removed in 2008. Materials are inEnglish Historical Note

The Milltown Dam was a hydroelectric dam located seven miles east of Missoula, Montana, at the confluence of the Clark Fork and Blackfoot rivers near Milltown and Bonner, Montana. William A. Clark, a renowned copper mine investor and U.S. Senator, built the dam in 1908, to power his sawmill located in the town of Bonner, Montana before its electrical services were extended to the surrounding communities. In 1929, Montana Power Company purchased the dam from Clark and operated it until 2003, when Northwestern Energy assumed ownership of the dam as part of a collective purchase of Montana Power Company's electric and gas network.

A few months after the dam was built, a flood washed toxic mine waste from the Anaconda Copper Mining Company's work site near Butte, Montana, 126 miles downstream before it settled in the newly formed reservoir behind the Milltown Dam. The severity of the toxic waste accumulation was not realized until 1981, when the Montana Department of Health and Environmental Science conducted its bi-annual water quality study that found high concentrations of arsenic in four residential wells in Milltown, Montana. This led to approximately 120 miles of the Clark Fork River being added to the Environmental Protection Agency's (EPA) National Priorities List (NPL), commonly referred to as a Superfund site, in September of 1983. The Milltown Dam was designated as one of three Operable Units (OU), a distinct area designated within a larger Superfund cleanup site, on the Clark Fork River. Over the next quarter of a century research and investigation into possible methods of containment, remediation, and restoration ensued as part of the most expensive Superfund cleanup operations in United States History at that time costing approximately $100 million.

Following the Milltown Dam's 1983 listing, local, state, and federal resources were focused on the containment of harmful mining waste until 1996, when a severe ice jam on the Blackfoot River scoured the reservoir's toxic sediments leading to increased public safety concerns. As a result, the EPA decided that the complete removal of the dam was the best plan of action. In 2006, contaminated sediments were moved to a disposal site in Opportunity, Montana, and the dam was removed in 2008.

Following the dam's removal, efforts to restore the watershed at the confluence of the Blackfoot and Clark Fork rivers began, and the area was designated as the 500-acre Milltown State Park. The park offers interpretive sites, historical information, and outdoor recreation opportunities. In addition to public access, efforts were made to restore native vegetation in the Clark Fork and Blackfoot river flood plains.

The Milltown Dam Collection contains official and unofficial records about the dam and its operation from a variety of record creators. The collection includes reports, pamphlets, receipts, logbooks and photographs of energy output, construction, breakdowns, and maintenance work carried out on the dam. It also includes safety and licensing records required by the Federal Energy Regulatory Commission.

Records in the collection include those created by William A. Clark's affiliated companies between 1908 and 1929, the Montana Power Company, which owned and operated the dam between 1929 and 2003, and Northwestern Energy, which owned and operated the project from 2003 until its shutdown in 2006.

The collection also contains risk assessment and remedial action plan reports that were generated as part of the Superfund cleanup process. This includes reports generated by third party researches, private businesses, and local, state, and federal government agencies. Also included in the collection is a record of public commentary surrounding the Superfund cleanup process. The removal of the dam is documented mainly in audiovisual formats. This includes photographs of the powerhouse shutdown, an audio recording conducted by Missoula County Environmental Health Supervisor Peter Nielson, and video footage created by Missoula Community Access Television. Missoula Community Access television and Montana Power Company videos concerning the dam's history, ice jams, and the cleanup process are also housed in this collection.

This collection has been arranged into seven series, many with subseries.

Series I: Drawings and Prints, 1906-1998, 0.5 linear feet

Series II: Reports and Logbooks, 1929-2005, 9.75 linear feet

Sub-series I: Daily Reports and Logs, 1951-2002, 8.0 linear feet

Sub-series II: Monthly Reports and Logs, 1945-2005, 1.0 linear feet

Sub-series III: Hourly Logs, 1978-1986, 0.25 linear feet

Sub-series IV: Monthly Generation Reports, 1972-2002, 0.25 linear feet

Sub-series V: Generator Outage Reports, 1977-2005, 0.25 linear feet

Sub-series VI: Monthly Storage Battery Reports, 1987-2002, 0.1 linear feet

Series III: Parts Information and Maintenance Records, 1906-2005, 2.75 linear feet

Series IV: Dam Safety Records, 1972-2006, 2.0 linear feet

Series V: Environmental Protection Agency Superfund Cleanup Materials, 1970-2005, 3.75 linear feet

Series VI: Photographs, 1907-2007, 1.0 linear feet including 2 CDs

Sub-series I: Milltown Dam Photographs, 1907-2003, 0.75 linear feet

Sub-series II: Kristi Hager Photographs, Undated, 1 folder

Sub-series III: Dam and Powerhouse Shutdown, 2006, 2 CD's

Series VII: Audiovisual Materials, 1997-2006, 1 CD and 13 DVD's

Sub-series I: Audio Recordings, 2006, 1 CD

Sub-series II: Video Recordings, 1996-2006, 13 DVD's

Researchers must use collection in accordance with the policies of Archives and Special Collections, the Maureen and Mike Mansfield Library, and The University of Montana-Missoula.

Researchers are responsible for using in accordance with 17 U.S.C. and any other applicable statutes. Non-exclusive copyright in a portion of the collection material was transferred to the University of Montana.

Milltown Dam Collection, Archives and Special Collections, Maureen and Mike Mansfield Library, University of Montana-Missoula.

This collection contains materials from accessions 2007-019, 2007-020, 2008-015, 2010-007, 2012-030, 2012-050, and 2014-054. Contact the Archives for details.

The materials in this collection were transferred to the Archives by Missoula County Environmental Health Supervisor, Peter Nielson, and Northwestern Energy.

These accessions were donated to the University of Montana's Archives and Special Collections with the understanding and intent that they would brought together as the Milltown Dam Collection. Original creator is indicated within each series. Duplicates were removed from the collection. Original order, when it existed, was maintained within series and sub-series.

This collection is indexed under the following headings in the online catalog. Researchers desiring materials about related topics, persons, or places should search the catalog using these headings.

Nielson, Peter Montana Power Company Northwestern Energy Missoula Community Access Television United States. Environmental Protection Agency United States. Federal Energy Regulatory Commission Milltown (Mont.)--Environmental conditions Milltown Dam (Mont.) Clark Fork Watershed (Mont. and Idaho) Blackfoot River Watershed (Mont.) Missoula (Mont.)--Politics and government Dam retirement--Environmental aspects Hazardous waste site remediation--Montana--Milltown Environmental policy--Montana--Milltown Sediment transport--Clark Fork Watershed (Mont. and Idaho) Dam failures--Risk assessment Missoula Montana Environmental Conditions Water and Water Rights Land Use Pollution Mines and Mineral Resources Public Utilities Series I Drawings and Prints 1906-1998 0.5 linear feet

This series contains large drawings and prints used in construction and maintenance projects. These materials were created and stored by the owners and operators of the Milltown Dam. At times related materials are grouped together in this series, but because specialized knowledge is required to accurately organize the materials in this series, the prints and drawings have been left in their original order. A drawing number key, located in box two folder one of this series, corresponds with most of the early drawings in this series up through the 1930s. Later drawings possess similar numerical identifiers, but the University of Montana Archives and Special Collections does not have the corresponding key.

Series I contains materials from accession 2010-007. The content was picked up at the Milltown Dam site by Archives staff. It has been listed largely at the item level. Materials originally housed together were divided into separate folders for preservation purposes and to increase accessibility, but otherwise have been maintained in the order in which they were received. The contents of folder 8 were individually rolled drawings and prints that were originally housed together in a single folder.

 2/1Drawing Number Key for Series I: Drawings and Prints, 1906-1998Undated VIII-9/1Scraps from Montana Power Company Drawings1988 VIII-9/1Plan for Power House1906 VIII-9/1Power House Sections and Floor Plans1907 VIII-9/1Wiring Diagram1907 VIII-9/1Conduit Wiring1907 VIII-9/1Toe of Dam1909 VIII-9/1Power House1908 VIII-9/2Bearing Details for Countershaft, Penstock Gates1912 VIII-9/2Sluice Gate for Dam1906 VIII-9/2Floor Plan Showing Reinforcements1907 VIII-9/2Flashboard Detail1911 VIII-9/2Flashboard Detail1911 VIII-9/2Penstock Gates for Exciter Turbines1907 VIII-9/2Steel Plate for Corners of Fore-bay Floor1907 VIII-9/2Emergency Flume Spillway1909 VIII-9/2Proposed Construction of South Abutment1909 VIII-9/2Exciter at Bonner Power HouseUndated VIII-9/2Flashboard Detail1917 VIII-9/22 Inch Pine Segments for Concrete Forms Against Turbine1907 VIII-9/2Segments for Concrete Arches1906 VIII-9/22 Inch Pine Segments for Concrete Forms Against Turbine Undated VIII-9/2Thimble in Concrete Wall1907 VIII-9/2Upstream Wall of Power HouseUndated VIII-9/2Control Switches and Solenoid on 11000 Volt Line1913 VIII-9/224 inch Crib Showing StepsUndated VIII-9/2Floor Beams and Reinforcement Bars1907 VIII-9/2Downstream Toe of Dam1908 VIII-9/3Sounding at Toe of Dam1976 VIII-9/3Section of Power HouseUndated VIII-9/3Proposed Modifications of Dam and Power Plant1907 VIII-9/4Clipping from a Drawing of Unit #7Undated VIII-9/4Conduit Wiring1907 VIII-9/4Plan for Power House1908 VIII-9/4Drawing No. 81906 VIII-9/4Elbow Attached to Thimble to be Used for Draining Pond1907 VIII-9/4Section Through Spillway at Break Showing Proposed Method of Reconstruction1908 VIII-9/4Wiring Diagram of Generating StationUndated VIII-9/4Comparison of Bids for Equipment of Power House1906 VIII-9/4Elevations Along Breakwater1914 VIII-9/4Stability Diagram to Accompany Plan No. 2 for Reconstruction Work1907 VIII-9/4Stability Diagram of Concrete Wall Forming Upstream Side of Power House1907 VIII-9/4Forms and Tremie1930 VIII-9/4East End Power House1907 VIII-9/4Down Stream Elevation of Power House1908 VIII-9/4General Plan of Power House Walls1907 VIII-9/4Clark's Dam1906 VIII-9/4Penstock Gates for Power House1907 VIII-9/4Stability Diagram to Accompany Plan No. 2 for Reconstruction Work1907 VIII-9/4Sketch of New Breakwater Wall and Toe Reinforcement1930 VIII-9/4Penstock Gate1958 VIII-9/4Gate Slides and Seals for Penstock Tubes1906 VIII-9/4Drawing No. 42Undated VIII-9/5Downstream Elevation of Power House1908 VIII-9/5Proposed Reconstruction1908 VIII-9/5Plan and Elevation Views1965 VIII-9/5Soundings1930 VIII-9/5Soundings1929 VIII-9/5Sluice pipes for Draining Dam1907 VIII-9/5Clark's Dam1906 VIII-9/5Reconstruction of Downstream Toe of Dam1909 VIII-9/5Abutment Wall Elevation and Cross Sections1965 VIII-9/5Steel Details for Penstock Gate1958 VIII-9/5Flashboard Detail1911 VIII-9/5Penstock Gate for Exciter Turbines1959 VIII-9/5End View Water Wheels of Exciter Unit1909 VIII-9/5Penstock Gate for Exciter Turbines1907 VIII-9/5Sketch Showing Improvements to be Made1908 VIII-9/5Proposed Concrete and Steel Plate Fillet for Fore-bay1907 VIII-9/5Wing Cribs Upstream Side of Dam and on Sides of Fore-bay1907 VIII-9/5General Scheme of Reconstruction1909 VIII-9/5Abutment Wall-Clark's Dam as Constructed1930 VIII-9/5Construction at Toe Dam1931 VIII-9/5Cut-off Wall Clark's Dam North Side Fore-bay1931 VIII-9/5Cross Sections Abutment Wall1931 VIII-9/6Tail Race Walls and Reconstruction South End1931 VIII-9/6Sketch Showing Rock Pile to be Removed from Clark's DamUndated VIII-9/6Sounding Clark's Dam Elevations and Toe1930 VIII-9/6Section through Gap at South End of Dam1909 VIII-9/6Section Through Roof Showing Lumber and Ruberoid Required1907 VIII-9/6Details of Brick Work1907 VIII-9/6Sections of Milltown (Clark) Dam1938 VIII-9/6Summation Quantities1930 VIII-9/6Details of Grid Bars and Scheme of Holding Them Together1906 VIII-9/6Concrete Wall from Upstream Side of Power House1906 VIII-9/6Downstream Elevation of Power House Walls1906 VIII-9/6Section Through Power House1908 VIII-9/6Supplement to Conduit Drawing No.11907 VIII-9/6Conduits in Power House1912 VIII-9/6Grid Bar Supports1906 VIII-9/6West End Elevation of Power House1906 VIII-9/6Crest of SpillwayUndated VIII-9/6Field Modification to 230-D-45 Tower1976 VIII-9/6Detail of Stem Guide and BracketUndated VIII-9/6Unlabeled DrawingUndated VIII-9/6Exit Stem for 9x14 Sluice GateUndated VIII-9/6Stability Diagram of Proposed Concreate Wall for Upstream Side of Power House1907 VIII-9/7Arrangement of Entrance Panels1907 VIII-9/7Busbar Compartment at H.T. Wiring1907 VIII-9/7Wooden Segments for Circular Openings Through Concrete Wall Segments1906 VIII-9/7Stability Diagram of Concrete Wall Upstream Side of Break in Dam1908 VIII-9/7Elevation of Points on Top of Breakwater to Determine Settlement and Soundings in Cribs1909 VIII-9/7Steel Details Penstock Gate for Exciter Turbines1959 VIII-9/7Gate Hoist Frame1957 VIII-9/7Operating Mechanism Gate 7 and 81912 VIII-9/7Penstock Gates1907 VIII-9/7Wiring Diagram of Generating Station1907 VIII-9/7Downsteram Elevation of Power House1908 VIII-9/7Design of Cribwork Toe of Dam1909 VIII-9/7Gate Hoist Instalation1957 VIII-9/7Gate with Steel Frame Attached for Lifting with Hydraulic Jack1906 VIII-9/7Detail of Form for Toe Reinforcing1925 VIII-9/7Roof Plan of Power House1911 VIII-9/7Pockets to be Cut in Concrete Wall for Steel Brace1907 VIII-9/7Arrangement of Transformers and Wiring1907 VIII-9/7Flashboard Detail1911 VIII-9/7Flashboard Detail1917 VIII-9/7Transformers and Busbar Compartments and Wiring1907 VIII-9/7Diagram of Switchboard Wiring in Power House1907 VIII-9/7Windows for Monitor of Power house1907 VIII-9/8Project Boundry1989 VIII-9/8General Plan of Dam and PlantUndated VIII-9/8Toe Sounding1975 VIII-9/8Rehabilitation Power HouseUndated VIII-9/8Milltown Plant Power Wiring Diagrams1953 VIII-9/9Spillway Repair

4 drawings

1983 VIII-10/10Dif Metering

4 drawings

1975 VIII-10/11One Line Diagram

3 drawings

1998 VIII-10/12Spillway Repair

16 drawings

1983 VIII-10/13Spillway Light, Project Area, Dividing Block Fore-bay

35 drawings

Undated VIII-10/14Sluceway Structure Intake Gates and Trash Rack

11 drawings

Undated VIII-10/15Exhibit L License Application

6 Drawings

Undated VIII-10/16Rehabilitation Prints

8 drawings

Undated VIII-10/17Milltown Project

9 drawings

Undated VIII-10/18Rehabilitation

56 drawings

1985 Series II Reports and Logbooks 1929-2005 9.75 linear feet

This series contains reports, records, and logs of the Milltown Dam's operations created and stored by the owners and operators of the Milltown Dam, and it is divided into six sub-series. These materials contain information on the dams energy output, weather conditions, water levels and flows, and general operation notes.

Each sub series is arranged chronologically reflecting original order. Duplicated reports and logs were removed in processing. Series II is divided into six sub-series processed at the folder. All of the sub-series contain materials from accession 2010-007 and are arranged chronologically.

 Sub-series 1 Daily Reports and Logs 1951-2002 8.0 linear feet

This sub-series contains records of A.C. amps, D.C. amps, and Kilowatt output for the dam’s five generators and two exciters as well as records of water flow, reservoir elevation, and weather recorded daily.

Contents are arranged chronologically.

 OS 1Daily ReportJuly 21- August 16, 1951 OS 1Daily ReportApril 20-June 19, 1952 OS 1Daily ReportMarch 23-June 30, 1953 OS 1Daily ReportJuly 1-September 29, 1953 OS 1Daily ReportSeptember 30-December 31, 1953 OS 1Daily ReportJanuary-April, 1954 OS 1Daily ReportMay-December, 1954 2Daily ReportJanuary, 1983 2Daily ReportFebruary, 1983 2Daily ReportMarch, 1983 2Daily ReportApril, 1983 2Daily ReportMay, 1983 2Daily ReportJune, 1983 2Daily ReportJuly, 1983 2Daily ReportAugust, 1983 2Daily ReportSeptember, 1983 2Daily ReportOctober, 1983 2Daily ReportNovember, 1983 2Daily ReportDecember, 1983 3Daily ReportJanuary, 1986 3Daily ReportFebruary, 1986 3Daily ReportMarch, 1986 3Daily ReportApril, 1986 3Daily ReportMay, 1986 3Daily ReportJune, 1986 3Daily ReportJuly, 1986 3Daily ReportAugust, 1986 3Daily ReportSeptember, 1986 3Daily ReportOctober, 1986 3Daily ReportNovember, 1986 3Daily ReportDecember, 1986 3Daily ReportUndated 4Daily ReportMay-August, 1987 4Daily ReportSeptember-December, 1987 4Daily ReportJanuary-April, 1988 4Daily ReportMay-August, 1988 5Daily ReportSeptember-December, 1988 5Daily ReportJanuary-April, 1989 5Daily ReportMay-August, 1989 5Daily ReportSeptember-December, 1989 6Daily ReportJanuary-April, 1990 6Daily ReportMay-August, 1990 6Daily ReportSeptember-December, 1990 6Daily ReportJanuary-April, 1991 7Daily ReportMay-August, 1991 7Daily ReportSeptember-December, 1991 7Daily ReportJanuary-April, 1992 7Daily ReportMay-August, 1992 8Daily ReportSeptember-December, 1992 8Daily ReportJanuary-April 1993 8Daily ReportMay-August, 1993 8Daily ReportSeptember-December, 1993 9Daily ReportJanuary-April, 1994 9Daily ReportMay-August, 1994 9Daily ReportSeptember-December, 1994 9Daily ReportJanuary-April, 1995 10Daily ReportMay-August, 1995 10Daily ReportSeptember-December, 1995 10Daily ReportJanuary-April, 1996 10Daily ReportMay-August, 1996 11Daily ReportSeptember-December, 1996 11Daily ReportJanuary-April, 1997 11Daily ReportMay-August, 1997 11Daily ReportSeptember-December, 1997 12Daily ReportJanuary-March, 1998 12Daily ReportApril-June, 1998 12Daily ReportJuly-September, 1998 12Daily ReportOctober-December, 1998 13Daily ReportJanuary-March, 1999 13Daily ReportApril-June, 1999 13Daily ReportJuly-September, 1999 13Daily ReportOctober-December, 1999 13Daily ReportJanuary-March, 2000 14Daily ReportApril-June, 2000 14Daily ReportJuly-September, 2000 14Daily ReportOctober-December, 2000 14Daily ReportJanuary-March, 2001 14Daily ReportApril-June, 2001 15Daily ReportJuly-September, 2001 15Daily ReportOctober-December, 2001 15Daily ReportJanuary-March, 2002 15Daily ReportApril-June, 2002 15Daily ReportJuly-September, 2002 16Daily ReportOctober-December, 2002 16Daily ReportJanuary-April, 2003 16Daily ReportMay-August, 2003 16Daily ReportSeptember-December, 2003 17Daily ReportJanuary-April, 2004 17Daily ReportMay-August, 2004 17Daily ReportSeptember-December, 2004 17Daily ReportJanuary-April, 2005 17Daily ReportMay-August, 2005 17Daily ReportSeptember-December, 2005 17Daily ReportJanuary-April, 2006 18Daily ReportMay-August, 2006 18Daily ReportSeptember-December, 2006 18Daily ReportJanuary-April, 2007 18Daily ReportMay-August, 2007 18Daily ReportSeptember-December, 2007 18Daily ReportJanuary-February, 2008 19Milltown Plant Daily Log BookJuly 27, 1995-October 1, 1999 19Milltown Plant Daily Log BookOctober 2, 1999-November 10, 2000 19Milltown Plant Daily Log BookNovember 11, 2000-May 14, 2002 Sub-series 2 Monthly Reports and Logs 1945-2005 1.0 linear feet

This sub-series contains records of temperature, water data, meter readings, and generation data.

Contents are arranged chronologically.

 OS 20Weather, Water, and Electrical Record BookNovember 1929-May 1945 OS 20Weather, Water, and Electrical Record BookJune 1945-June 1997 OS 21Monthly Log1955-1959 OS 21Monthly Log1960-1963 OS 21Monthly Log1964-1967 OS 21Monthly Log1968-1971 OS 21Monthly Log1972-1975 OS 21Monthly Log1976-1979 22Monthly Log1980 22Monthly Log1981 22Monthly Log1982 22Monthly Log1983 22Monthly Log1984 22Monthly Log1985 22Monthly Log1986 22Monthly Log1987 22Monthly Log1988 22Monthly Log1989 22Monthly Log1990 22Monthly Log1991 22Monthly Log1992 22Monthly Log1993 22Monthly Log1994 22Monthly Log1995 22Monthly Log1996 22Monthly Log1997 22Monthly Log1998 22Monthly Log1999 22Monthly Log2000 22Monthly Log2001 23Monthly Log2002 23Monthly Summary of Daily Readings2003 23Monthly Summary of Daily Readings2004 23Monthly Summary of Daily Readings2005 Sub-series 3 Hourly Logs 1978-1986 0.25 linear feet

This sub-series consists of eight handwritten logbooks of data collected hourly. The contents are not clearly labeled.

Contents are arranged chronologically.

 23Hourly Log Book1978-1979 23Hourly Log Book1980-1981 23Hourly Log Book1981-1982 23Hourly Log Book1983 23Hourly Log Book1984 23Hourly Log Book1985 23Hourly Log Book1986 23Hourly Log Bookundated Sub-series 4 Monthly Generation Reports 1972-2002 0.25 linear feet

This sub-series contains monthly reports of water data, operation data, and total energy generated by the Milltown Dam. It also provides information about plant shutdowns and the daily average load measured in Kilowatts.

Contents are arranged chronologically.

 23Monthly Generation Reports1972-1979 23Monthly Generation Reports1980-1989 23Monthly Generation Reports1990-1999 24Monthly Generation Reports2000-2005 24Miscellaneous Monthly Generation Reports1992-2002 Sub-series 5 Generator Outage Reports 1977-2005 0.25 linear feet

This sub-series contains log sheets showing the time, date, and cause of generator shutdowns.

Contents are arranged chronologically.

 24Generator Outage Report1970s 24Generator Outage Report1980s 24Generator Outage Report1990s 24Generator Outage Report2000s 24Generator Outage Reportundated Sub-series 6 Monthly Storage Battery Reports 1987-2002 0.1 linear feet

This sub-series contains data sheets showing storage battery volts and amps collected monthly.

Contents are arranged chronologically.

 24Monthly Storage Battery Report1987-1989 24Monthly Storage Battery Report1990-1999 24Monthly Storage Battery Report2000-2002 Series III Parts Information and Maintenance Records 1929-1998 2.75 linear feet

This series contains drawings, prints, receipts, reports and logs related to maintenance, upkeep, and construction on the Milltown Dam. The owners and operators of the Milltown Dam generated and stored these records.

Materials are arranged alphabetically, which reflects the original order of these records. Photographs were removed and incorporated into Series VI, Sub series I: Milltown Dam Photographs. Series III contains materials from accession 2010-007 and is arranged alphabetically reflecting original order.

 24 / 11Alignment Survey Data Report1994 25 / 1Annunciator Prints1968 25 / 2Ballast Wiring ShopUndated 25 / 3Battery Information1987-1988 and Undated 25 / 4Bearings1971, 1977, 1981 and Undated 25 / 5Bearing #11966-1967 and 1970-1971 25 / 6Bearing #21972-1973 25 / 7Bearings #2-51971-1972 25 / 8Boat Restraints1995 and undated 25 / 9Brushes1962, 1965, 1995 and 2000 25 / 10Camp WellUndated 25 / 11Commutator and Slip Ring InformationUndated 25 / 12Commutator and Slip Ring Maintenance Handbook1949 25 / 13Dam Reconstruction Information1984-1985 25 / 14Differential Relays1953 and Undated 25 / 15Diving Inspection1983 25 / 16Drains Information1983 and Undated 25 / 17Exciter Bearings1963, 1982, 1991 and Undated 25 / 18Exciter Bearing TransparencyUndated 26 / 1Exciter Information1906, 1941 and 1957 26 / 2Exciter #1 Reconditioning1974 26 / 3Exhaust Fan Information1988 and 1990 26 / 4Federal Energy Regulatory Commission Inspections1980, 1993 and 2003 26 / 5Federal Energy Regulatory Commission Licensing1968-2000 26 / 6Federal Energy Regulatory Commission Monitoring Data1984 26 / 7Federal Energy Regulatory Commission Security Checklist2002 26 / 8Field Switch InformationUndated 26 / 9Fisheries Mitigation Annual Report2000 26 / 10Fixed Wheel Prints1986 26 / 11Generation Power Factor1969 and undated 26 / 12Generator Controls and RelaysUndated 26 / 13Generator Schematic, Alarm Panel, and Exciter Panel Layout and Wiring Diagrams1953 and 1975 26 / 14Governor Information (1 of 2)1951, 1955, 1957, 1960 and 1962 26 / 15Governor Information (2 of 2)1951, 1955, 1957, 1960 and 1962 26 / 16Governor Wiring #4Undated 26 / 17Gravity Wall Seepage Report1997 26 / 18High Water Information1972 26 / 19High Water Information1974 26 / 20High Water Information1981 27 / 1High Water News Reports1975 27 / 2High Water Stream Flow Data1997 27 / 3Insurance Map of MilltownUndated 27 / 4Leads and Field ReconductoringUndated 27 / 5Lights OverheadUndated 27 / 6Maintenance Annual Reports1993-2002 27 / 7Maintenance Major Rehabilitation1980 27 / 8Maintenance Schedules1979-1980 and 1982 27 / 9Miscellaneous Notes1971 27 / 10Monitoring Log and photographs2000 27 / 11Panel Hoist Inspection1994 27 / 12Panel Hoist PrintsUndated 27 / 13Panel Layout Prints1975 27 / 14Penstock Gate Prints1957 and 1959 27 / 15Penstock Monitoring Program and Logs1997-2006 27 / 16Plant Wiring Diagrams1953 and 1975 27 / 17Plugging SwitchesUndated 27 / 18Pond Elevation AlarmUndated 27 / 19Pond Level TransducerUndated 28 / 1Project MapsUndated 28 / 2Project 2188 Exhibits F and G1992 28 / 3Pump InformationUndated 28 / 4Radial Gate1989, 1998, 2003-2004 and Undated 28 / 5Recloser1975 and Undated 28 / 6Recreation Reports and Information1975 and 1987-1989 28 / 7Regulator Instructions and PrintsUndated 28 / 8Rehabilitation Phase II Request for Proposals1988 28 / 9Rehabilitation Proposal Drawings1985 28 / 10Relay MonitoringUndated 29 / 1Reservoir Drawdowns1980 29 / 2Reservoir Drawdowns1981 29 / 3Reservoir Drawdowns1984 29 / 4Reservoir Drawdowns1985 29 / 5Reservoir Drawdowns1989 29 / 6Reservoir Drawdowns2001 29 / 7Reservoir Drawdowns2002 29 / 8Reservoir Drawdowns2003 29 / 9Reservoir Drawdowns2004 29 / 10Reservoir Drawdowns2005 29 / 11Reservoir Drawdown RequirementsUndated 29 / 12Screen Rake Hoist Inspection and Information1994-1998 29 / 13Sign Inventory1995-2006 29 / 14Silt Accumulation Chart1979 29 / 15Solid State Voltage Regulator1980 29 / 16Sounding and Leakage Tests1977 and 1983 29 / 17Spillway and Dividing Blocks Evaluation Graphs1973-1982 29 / 18Spillway Bridge Prints1996 29 / 19Spillway Emergency Repairs1986 29 / 20Spillway Gate Operation Certificate1996, 2000-2007 30 / 1Spillway Leveling Prints1980 30 / 2Spillway Rehabilitation General Construction Request for Proposals1986 30 / 3Tailrace Efficiency CurveUndated 30 / 4Thermal Gun Readings1998 30 / 5Toe Sounding1981 30 / 6Toe Sounding Charts and Memorandum1975 and 1977 30 / 7Training Wall Prints1973 30 / 8TransformersUndated 30 / 9Trash Boom1971-1972 30 / 10Turbine Alignment1980-1981 30 / 11Turbine Bearings1970 30 / 12Turbine Gate Control Schematic1969 30 / 13Turbines, MiscellaneousUndated 30 / 14Turbine Water Wheel Specifications and Proposal1927 30 / 15Turbines # 3 and 41954 30 / 16Turbine # 51972 30 / 17Water Safety Boom1970 and 1972 30 / 18Water Supply Outlook for Montana1975 30 / 19Water Wheels, Turbines, and Generator Cost Sheet1937 30 / 20Water Utilization Factor1996-2002 30 / 2112.5kv Feeder Circuit Map for Missoula, MontanaUndated Series IV Dam Safety Records 1972-2006 2.0 linear feet

This series contains reports and emergency procedure documents from the Milltown Dam related to Federal Energy Regulatory Commission (FERC) standards. This includes documents from both the Montana Power Company and Northwestern Energy. In this series, the Milltown Dam is also referred to as the Milltown Hydroelectric Project and the FERC Project #2543.

Series IV contains materials from accessions 2012-050 and 2014-054, and is arranged chronologically. Materials housed in binders were rehoused in acid free folders during processing.

 31 / 1Dam Safety Investigations1972 31 / 2Water Resource and Hazard Planning Report for the Clark Fork River Valley above Missoula1974 31 / 3Milltown Hydroelectric Project Engineering Evaluation1984 31 / 4Inspection of Project Works1991 32 / 1Draft Safety Analysis Report1995 32 / 2Community Action Plan for the Bonner Area Communities1996 32 / 3Inspection of Project Works1996 32 / 4Overtopping Evaluation2000 32 / 5Ice Jam Evaluation2000 32 / 6Alignment Survey Data Report2000 33 / 1Alignment Survey Data Report2001 33 / 2Spillway Leakage Evaluation2001 33 / 3Missoula County Public Opinion survey Regarding the Milltown Superfund Site2001 33 / 4Inspection of Project Works (1 of 3)2001 33 / 5Inspection of Project Works (2 of 3)2001 33 / 6Inspection of Project Works (3 of 3)2001 33 / 7Inspection of Project Works Appendix D (1 of 4)2001 33 / 8Inspection of Project Works Appendix D (2 of 4)2001 34 / 1Inspection of Project Works Appendix D (3 of 4)2001 34 / 2Inspection of Project Works Appendix D (4 of 4)2001 34 / 3Inspection of Project Works Appendix E (1 of 2)2001 34 / 4Inspection of Project Works Appendix E (2 of 2)2001 34 / 5Drilling Contract bid documents and geophysical testing proposal2002 34 / 6Inspection of Right Bank Seepage Conditions2002 34 / 7Emergency Action Plan2003 34 / 8Alignment Survey Data Report2003 34 / 9Dam Foundation Exploration Addendum 1 to 2001 Inspection Project Works2003 35 / 1Addendum 2 to 2001 Inspection of Project Works2004 35 / 2Alignment Survey Data Report2004 35 / 3Alignment Survey Data Report2005 35 / 4Alignment Survey Data Report2006 35 / 5Energency Action Plan Updated Replacement2006 35 / 6Emergency Action PlanUndated Series V Environmental Protection Agency Superfund Cleanup Materials 1970-2005 3.75 linear feet

This series contains research materials and reports related to the Milltown Dam's NPL status and the Superfund cleanup process. The documents were collected by Peter Nielson, Environmental Health Supervisor for Missoula County, Montana, from 1992 to 2018.

Materials were rehoused and placed into acid free folders during processing, but were left in the order in which they were received by the Archives. However the last folder in this series, titled "Save Our Bridge Campaign," contains materials related to the efforts of Bonner and Milltown residents to protect a walking bridge that was scheduled for removal in 2006. This is indirectly related to the Milltown Dam Superfund cleanup process and as a result was placed by the processor at the end of the series. Series V houses materials from accession 2014-054 and is processed at the folder level.

 36 / 1Cultural Resource Report1990 36 / 2Sediments Investigations Sampling and Analysis Plan1989 36 / 3Continued Releases Risk Assessment1994 36 / 4Exposure Survey Plan1990 36 / 5Application for Amendment of License Milltown Supplemental Data Supporting Design Report1985 36 / 6Inflatable Rubber Dam Retrofit Preliminary Engineering Report2001 36 / 7Milltown Dam Conceptual Channel Design Report2001 36 / 8Revised Final Draft Focused Feasibility Study2001 37 / 1Two Rivers MapsUndated 37 / 2Milltown Feasibility Study (1 of 3)2001 37 / 3Milltown Feasibility Study (2 of 3)2001 37 / 4Milltown Feasibility Study (3 of 3)2001 37 / 5Milltown Focused Feasibility Study (1 of 3)2001 37 / 6Milltown Focused Feasibility Study (2 of 3)2001 37 / 7Milltown Focused Feasibility Study (3 of 3)2001 37 / 8Milltown Focused Feasibility Study Comments (1 of 3)1999-2001 38 / 1Milltown Focused Feasibility Study Comments (2 of 3)1999-2001 38 / 2Milltown Focused Feasibility Study Comments (3 of 3)1999-2001 38 / 3Milltown Combined Feasibility Comments (1 of 2)2001-2002 38 / 4Milltown Combined Feasibility Comments (2 of 2)2001-2002 38 / 5Milltown Dam Federal Energy Regulatory Commission License Surrender2005 38 / 6Milltown Memorandum of UnderstandingUndated 38 / 7Public Service Commission (1 of 2)1998-2002 39 / 1Public Service Commission (2 of 2)1998-2002 39 / 2Milltown Superfund General Background1982-1995 39 / 3Risk Assessment Correspondence (1 of 2)1970-2001 39 / 4Risk Assessment Correspondence (2 of 2)1970-2001 39 / 5Milltown Federal Energy Regulatory Commission Relicensing (1 of 4)1987 and 2000-2005 39 / 6Milltown Federal Energy Regulatory Commission Relicensing (2 of 4)1987 and 2000-2005 40 / 1Milltown Federal Energy Regulatory Commission Relicensing (3 of 4)1987 and 2000-2005 40 / 2Milltown Federal Energy Regulatory Commission Relicensing (4 of 4)1987 and 2000-2005 40 / 3Environmental Protection Agency, Remedial Action Master Plan Draft1983 40 / 4Assessment of Damages to Anglers and other Recreators from Injuries to the Upper Clark Fork River Basin1993 40 / 5Draft Final Screening of Alternatives Summary Report1995 40 / 6Draft Addendum to the Draft Final Screening of Alternatives Summary Report1995 40 / 7Addendum to the Draft Final Screening of Alternatives Summary Report1995 41 / 1Revised Community Relations Plan1992 41 / 2Public Health Evaluation Work Plan, Base Line Risk Assessment1992 41 / 3Proposed Plan for Interim Institutional Controls1992 41 / 4Milltown Air Quality Monitoring Program Draft Report, Volume I1992 41 / 5Milltown Air Quality Monitoring Program Draft Report, Volume II1992 41 / 6Milltown Air Quality Monitoring Program Draft Report, Volume III1992 41 / 7Institutional Controls Workshop1992 41 / 8Public Health Evaluation Exposure Survey Results Draft1991 41 / 9Endangerment Assessment Work Plan1990 41 / 10Data Management Plan1990 42 / 1Sediments Investigations Sampling and Analysis Plan1990 42 / 2Health and Safety Plan and Site Management Plan1990 42 / 3Quality Assurance Project Plan1990 42 / 4Discussion Points Wetland Work Plan1990 42 / 5Draft Work Plan Continued Releases Risk Assessment1990 42 / 6Sampling Program at Milltown and Bonner Junction Program Overview and QA/QC1990 43 / 1Work Plan Scoping Document1989 43 / 2Technical Comments on CERCLA Documents and Remedial Investigations and Feasibility Studies1989 43 / 3Revised Work Plan For Negotiation Support and Oversight1989 43 / 4Feasibility Study Work Plan Final Draft1989 43 / 5Outline of the Endangerment Assessment Work Plan Draft1989 43 / 6Quality Assurance Project Plan1989 43 / 7Human Health Evaluation Work Plan Draft1989 43 / 8Remedial Investigation Completion and Feasibility Study Work Plan1989 44 / 1Cover Letter for Data Summary Report For Milltown Interim Groundwater Monitoring1998 44 / 2Clark Fork River Ecological Risk Assessment1999 44 / 3Sampling and Analysis Plan1988 44 / 4Ecological Risk Assessment Clark Fork River Operable Unit, Volume II1999 44 / 5Save Our Bridge Campaign2006 Series VI Photographs 1907-2007 1.0 linear feet

This series is a collection of photographs taken by Milltown Dam affiliates, photographer Kristi Hager, and other unknown photographers. It contains photographs from accessions 2010-007, 2007-019, 2007-020, and 2008-015 and is divided into three sub-series.

The majority of photos are processed at the folder level. Materials in each sub-series are arranged alphabetically by folder title.

 Sub-series 1 Milltown Dam Photographs 1907-2003 0.75 linear feet

This sub-series contains images collected by the owners and operators of the Milltown Dam from 1907-2003. It includes images of the dam’s construction, maintenance, function, and recreation activities.

Contents are arranged alphabetically by folder title.

 VIII-10Aerial PhotographsUndated 45 / 1Dam ConstructionCirca 1907 46 / 1Cement Cutting1980 46 / 2Crest of Dam After 17 Board Break1973 46 / 3Dam1997 46 / 4Dam1998 46 / 5Dam Break Pictures1972 46 / 6Dam Exterior and Recreation2003 46 / 7Dam InspectionUndated 46 / 8Dam Flashboard Failure due to Ice and Debris1986 46 / 9Dam Interior, Exterior, Reservoir and MaintenanceUndated 46 / 10Drawdown2002 46 / 11Exciter #1 Overhaul2001 46 / 12Exciter #21996 46 / 13Exciter #2 Broken Yoke1980 46 / 14Exciter #2 Clutch Assembly1982 46 / 15High WaterUndated 46 / 16High Water1997 46 / 17High Water and Debris1975 46 / 18IceUndated 46 / 19Ice Breakup1989 46 / 20Ice Breakup1996 46 / 21Plant and Unit #41971 46 / 22Plant Pictures After Interior Paining1974 46 / 23Sewer1968 46 / 24Sluice Gate, Exciter Gate, and Unlabeled Photographs1968 and 1970 47 / 1Spillway Repair1981 47 / 2Turning Down #2 Shaft After Buildup1972 47 / 3Unit #1 Generator Rewind1958 47 / 4Unit #21997 47 / 5Unit #2 Downstream TurbineUndated 47 / 6Unit #2 Shaft Buildup at Packing Area1980 47 / 7Unit #2 Upstream Bearing1972 47 / 8Unit #3 Overhaul1970 47 / 9Unit #3 Overhaul2002 47 / 10Unit #4 Maintenance1998 47 / 11Unit #5 Shaft Turning and Bearing with Cap1972 47 / 12Unit #5 Turning Shaft Packing Area for Buildup1981 47 / 13Various Pictures including #1 Overhaul1969 47 / 14Loose PhotosUndated Sub-series 2 Kristi Hager Photographs circa 2005 1 folder (18 photographs and 18 negatives)

This sub-series is a collection of photographs taken by photographer Kristi Hager. It contains six color and twelve black and white photographs of the dam, powerhouse and spillway as well as the photonegatives.

 47 / 15Dam, Power House, and Spillway2006 Sub-series 3 Dam and Powerhouse Shutdown 2006 2 CD's

This sub-series contains images from the powerhouse and dam shutdown.

Contents are arranged alphabetically by folder title.

 digital imagesMilltown Project Final Plant Shutdown2006 digital imagesMilltown Dam Shutdown2006 Series VII Audiovisual Materials 1997-2006 1 CD and 13 DVDs

This series contains audiovisual records concerning the Milltown Dam's history, ice jams, and removal. It includes audio and video recordings created by Missoula Community Access Television, Peter Nielson, Northwestern Energy, and the Montana Power Company. Both digital and physical copies of these materials are available. Series VII contains materials from accessions 2007-020 and 2012-030.

This series is arranged chronologically.

 DVD cabinetMilltown Ice Jam

Moving image on DVD

1996 DVD cabinetMilltown Dam Ice Flow/Jam Event

Moving image on DVD

1996 DVD cabinetMilltown Reservoir: An educational Experience

Moving image on DVD

1997 DVD cabinetEPA Milltown Cleanup Plan

Moving image on DVD

2003 DVD cabinetGroundwater Pollution in Milltown

Moving image on DVD

2003 DVD cabinetMilltown Dam Shutdown

Audio recorded by Peter Nielson on CD

April 7, 2006 DVD cabinetMilltown Dam Construction and Safety

Moving image on DVD

2003 DVD cabinetMilltown Dam Power Plant Shut Down

Moving image on DVD

April 7, 2006 DVD cabinetThe Confluence of Two Rivers (2 copies)

Moving image on DVD

2006 DVD cabinetMilltown Dam Power Plant Shut Down (2 copies)

Moving image on DVD

2006 DVD cabinetMontana Power Company Ice Jam

Moving image on DVD

Undated