Seattle City Light Load and Flow Data, 1905-1995  PDF

Overview of the Collection

Creator
Seattle City Light
Title
Seattle City Light Load and Flow Data
Dates
1905-1995 (inclusive)
Quantity
10.4 cubic feet, (11 boxes)
Collection Number
1206-11
Summary
Data from City Light hydroelectric projects.
Repository
Seattle Municipal Archives
Seattle Municipal Archives
Office of the City Clerk
City of Seattle
PO Box 94728
98124-4728
Seattle, WA
Telephone: 206-233-7807
Fax: 206-386-9025
archives@seattle.gov
Access Restrictions

Records are open to the public.

Languages
English
Sponsor
Funding for processing this record series was provided through a grant from the National Historical Publications and Records Commission.


Historical NoteReturn to Top

City Light provides electricity and electrical and conservation services to its public and private customers. It is the largest public utility in the Pacific Northwest. Public responsibility for electrical energy dates to 1890 with creation of the Department of Lighting and Water Works. In 1902, Seattle voters passed a bond issue to develop hydroelectric power on the Cedar River under the administration of the Water Department. Electricity from this development began to serve Seattle in 1905. A City Charter amendment in 1910 created the Lighting Department. Under the leadership of Superintendent James D. Ross, the department developed the Skagit River hydroelectric project which began supplying power in 1924. Both public and private power was supplied to Seattle until 1951 when the City purchased the private electrical power supply operations, making the Lighting Department the sole supplier. The Boundary Project in northeastern Washington began operations in 1967 and supplied over half of City Light's power generation. By the early 21st century, approximately ten percent of City Light's income came from the sale of surplus energy to customers in the Northwest and Southwest with the remainder of City Light's financial support coming from customer revenue. The current name of the agency was adopted in 1978 when the Department was reorganized.

Content DescriptionReturn to Top

Records of the Power Management Branch, consisting of data on stream discharge and flows, lake and reservoir elevations, energy generation, load estimates and forecasts, and power studies on system capability. Data pertains to the Skagit Basin, Cedar River, Boundary Dam and other sources.

Flow data for Boundary Dam may also be found in Boundary Dam Project Records, series 1206-07.

Use of the CollectionReturn to Top

Preferred Citation

[Item and date], [Seattle City Light Load and Flow Data , Record Series 1206-11. Box [number], Folder [number]. Seattle Municipal Archives.

Administrative InformationReturn to Top


Detailed Description of the CollectionReturn to Top

The following section contains a detailed listing of the materials in the collection.

1206-11:  Load and Flow Data, 1905-1995Return to Top

Container(s) Description Dates
Box/Folder
1/1
Big Beaver Creek Measurement
1934-1942
1/2
Cedar River Hydrography
1909-1931
1/3
Cedar River Hydrography
1905-1933
1/4
Cedar River Hydrography
1919-1933
1/5
Cedar River Hydrography
1919-1934
1/6
Cedar River Hydrography
1905-1934
1/7
Cedar River Daily Discharges
1963-1964
1/8
Cedar River Daily Discharges
1960-1963
1/9
Cedar River Annual Runoff Summary
1926-1940
1/10
Cedar Lake Water Elevations
1919-1920
1/11
Cedar Lake Stream Gaging
1945
1/12
Daily Discharge Tables - USGS
1932-1962
1/13
Diablo Lake, Cedar Lake, Ruby Storage Dams Elevations
1919-1946
1/14
Diablo Lake Elevations
1928-1935
1/15
Diablo Lake Elevations
1929-1960
1/16
Diablo Lake Storage, Daily Change
1932-1937
1/17
Diablo Lake Water Levels
1929-1940
1/18
Diablo Reservoir Hydrographs
1929-1937
1/19
Diablo Reservoir - Skagit Runoff, July 1 to June 30, 39 years (unregulated)
1946-1963
1/20
Diablo Reservoir - Skagit Runoff, Aug 1 to July 31, 39 year (unregulated)
1946-1963
1/21
Diablo Reservoir - Skagit Runoff, Oct 1 to Sep 30, 40 year (unregulated)
1945-1963
1/22
Diablo Reservoir Water Levels, Discharge
1931-1955
1/23
Annual Runoff At Ferry Bar
1935-1959
1/24
Annual Runoff At Ferry Bar
1935-1936
1/25
Ferry Bar Flow computations
1950-1956
1/26
Ferry Bar Flow computations
1945-1949
1/27
Monthly Discharge At Ferry Bar
1953-1954
1/28
Gorge (Newhalem) Annual Runoff
1930-1963
1/29
Gorge (Newhalem) Annual Runoff
1929-1933
1/30
Annual Runoff at Gorge - Newhalem Stream Gaging Station Remote Registration
1946-1948
1/31
Annual Inflows Between Ross and Diablo
1950-1962
1/32
Annual Inflows Between Ross and Newhalem
1953-1962
1/33
Ross Dam Annual Runoff
1946-1958
1/34
Hydrographs of Skagit at Ross Dam Site
1919-1953
1/35
Ross Dam - Mass Diagram Data
1933-1942
1/36
Ross Lake Elevations
1928-1940
1/37
Ross Lake Elevations
1940-1966
1/38
Skagit Runoff - Ross Reservoir, July 1 to June 30, 39 Years (Unregulated)
1946-1963
1/39
Skagit Runoff - Ross Reservoir, August 1 to July 31, 39 Years (Unregulated)
1946-1963
1/40
Skagit Runoff - Ross Reservoir, Oct 1 - Sep 30, 40 Year (Unregulated)
1942-1964
2/1
Ross Reservoir Pondage and Stream Flow Study
1927
2/2
Ross Reservoir
1931-1951
2/3
Ross Reservoir Spillway, Preliminary Study
1944
2/4
Skagit River Above Devil's Elbow Measurement
1940-1941
2/5
Skagit River At Reflector Bar
1914-1943
2/6
Skagit Below Ruby, Flows
1939-1944
2/7
Skagit - Bert De Shaw's Notes
1932-1942
2/8
Skagit - British Columbia Discharge Notes
1932-1954
2/9
Skagit Below Ruby Discharge Sheets and Thunder Creek Gage Heights
1925-1930
2/10
Skagit Above Ruby, Gage Height
1931-1934
2/11
Skagit Hydrography
1947-1948
2/12
Skagit Hydrography
1948-1949
2/13
Skagit Hydrography
1949-1950
2/14
Skagit Hydrography
1950-1951
2/15
Skagit Hydrography
1951-1952
2/16
Skagit Hydrography
1952-1953
2/17
Skagit Hydrography
1953-1954
2/18
Skagit Hydrography
1954-1955
2/19
Skagit Hydrography
1955-1956
2/20
Skagit Hydrography
1956-1957
2/21
Skagit Hydrography
1957
2/22
Skagit Hydrography
1958-1959
2/23
Skagit Runoff Data
1939-1941
2/24
Skagit Runoff Summaries
1952-1958
2/25
Skagit Runoff - Diablo
1933-1960
2/26
Skagit Streamflow
1928-1948
2/27
Skagit Stream gaging
1931-1948
2/28
Skagit Stream gaging - Thunder Creek and Newhalem Creek
1962-1963
2/29
Skagit - Fisheries Minimum Flow Agreement
1980-1981
2/30
Skagit - Fisheries Minimum Flow Agreement
1973-1979
2/31
Skagit - Fisheries Minimum Flow Agreement
1974-1981
2/32
British Columbia Stream Gaging
1941-1957
2/33
Skagit River British Columbia and Dominion River Stage Gages - Photographs and Notes
1954
2/34
Low Water Complaint - Darigold Creamery At Burlington
1949
2/35
Summary Info For Northwest Power Pool - Skagit and Cedar Lake Runoff
1953-1955
2/36
Northwest Power Pool Flow Data - 25 Year Record, Skagit and Cedar Rivers
1953-1954
2/37
Northwest Power Pool Flow Data - 27 Year Record
1956
3/1
Northwest Power Pool Flow Data - 29 Year Record Skagit and Cedar Rivers
1956-1958
3/2
Northwest Power Pool Flow Data - 31 Year Record Skagit and Cedar Rivers
1960
3/3
Northwest Power Pool Flow Data - 33 Year Record Skagit and Cedar Rivers
1960-1964
3/4
Stream gaging and Hydrography Correspondence (Includes Photographs)
1935-1946
3/5
Conversion, AC to DC, Annual
1920-1957
3/6
Conversion and Self-Consumed
1963-1964
3/7
Current Used In Operation
1963-1964
3/8
Generated KW and Power
1926-1946
3/9
Load Studies
1920-1950
3/10
Load Studies
1930-1959
3/11
Operating Statistics
1915-1961
3/12
Daily Load Curves
1934-1961
3/13
Daily Load Curves
1939-1963
3/14
Federal Secondary Energy Combined With Boundary and Skagit
1962
3/15
Special 36-37 Analyses - Gorge Tunnel
1962
3/16
Load / Flow Reports and Summaries
1971-1972
3/17
Load Data
1937-1946
3/18
Load Data Reports
1943-1948
3/19
Future Growth Forecasts, Curves
1935-1938
3/20
Load Data
1972
3/21
Load Data Book
1928-1950
3/22
Hydro System Out-Put
1939-1940
3/23
Flow of Power - Account Form - Annual Records
1926-1951
3/24
Flow of Power - Account Form
1941
3/25
Flow of Power - Annual Records
1920-1943
3/26
Flow of Power Summary
1963-1964
3/27
Load Data
1940
3/28
Load Data (1,2,3,4) Original Sheets
1959
3/29
Load Data (1,2,3,4)
1963
3/30
Load Data (1,2,3,4)
1964
3/31
Load Data
1913-1962
3/32
Load Data
1963
3/33
Load Data
1964
3/34
Load Forecasts
1944-1945
3/35
System Forecasts
1946
3/36
System Load Curves
1937-1950
3/37
Ship Yard and System Load Curves
1918-1919
3/38
Maximum Load Demands
1917-1939
3/39
Load Durations and Energy Curves
1959-1961
3/40
Load Frequency Graphs, Load Curves - Seattle and Tacoma
1963
3/41
Load Frequency Graphs, Load Curves - Seattle and Tacoma
1964
3/42
Load Frequency Graphs, Load Curves - Seattle and Tacoma
1965
3/43
Load Frequency Graphs, Load Curves - Tacoma
1966
4/1
Operating Conditions, Load Curves
1941-1942
4/2
Operating Reports
1942
4/3
Operating Condition Reports - Interchange, BPA Allocations
1969
4/4
Operating Condition Reports - Interchange, BPA Allocations
1970
4/5
Net Seattle Load, Monthly
1948-1965
4/6
Net System Weekly Load
1950-1964
4/7
Coordinated Operation Report - Loads and Resources
1963-1964
4/8
Coordinated Operation Report - Loads and Resources
1964-1965
4/9
Coordinated Operation Report
1965
4/10
Transit System
1963-1964
4/11
Daily Load Worksheet
1989
4/12
Daily Load Worksheet
1990
4/13
Daily Load Worksheet
1990
4/14
Daily Load Worksheet
1990
4/15
Daily Load Worksheet
1990
4/16
Daily Load Worksheet
1991
4/17
Daily Load Worksheet
1991
4/18
Daily Load Worksheet
1992
4/19
Daily Load Worksheet
1992
4/20
Daily Load Worksheet
1992
4/21
Daily Load Worksheet
1993
4/22
Daily Load Worksheet
1993
5/1
Daily Load Worksheet
1993
5/2
Daily Load Worksheet
1994
5/3
Daily Load Worksheet
1994
5/4
Daily Load Worksheet
1994
5/5
Daily Load Worksheet
1995
5/6
Daily Load Worksheet
1995
5/7
Daily Load Worksheet
1995
5/8
Kilowatt Hour Production Statements
1920-1941
5/9
Load Data, Annual (FPC - 12E)
1952-1974
5/10
Boundary Plant Generation Summaries
1974-1975
5/11
Columbia, Kootenay and Pend Oreille River Regulation, for Rev. Base With Full Storage
1961
5/12
FPC Power Statements (Form 12E-1)
1974
5/13
Bonneville Power Administration Statements
1974
5/14
Bonneville Power Administration Letters re Computed Demand
1974-1975
5/15
Bonneville Power Administration Allocation Table No. 32
1962-1963
5/16
Allocation Tables and Correspondence
1964-1973
5/17
Snoking Loss Data
1967
5/18
Special Jobs (Calculations)
1966-1975
5/19
Completed Assignment (Calculations, etc.)
1961-1970
5/20
Load Forecast For Northwest Power Pool
1959-1965
5/21
Load Estimating For Northwest Power Pool
1955-1965
5/22
Load Estimates For Northwest Power Pool
1964-1965
5/23
Load Estimates For Northwest Power Pool, July 1963 - June 1965
1963
5/24
Loads, Actual and Estimated
1968-1969
5/25
Reservoir Operation and Calculations - Seattle and Tacoma
1958
5/26
Regulation Studies - Hydro Capabilities
1936-1959
5/27
Computed Demand, Loads
1956-1961
5/28
Computed Demand Studies
1957-1958
5/29
Computed Demand Studies With and without Ross 4th Unit
1956
5/30
Computed Demand Programs
1961-1973
6/1
Capability Studies - Loads
1956-1961
6/2
Seattle and Tacoma Load Estimates
1956-1963
6/3
Seattle and Tacoma Load Estimates
1957
6/4
Capability Studies By Tacoma Public Utilities
1960-1962
6/5
Seattle Capabilities In Regard To Combined Seattle - Tacoma Contract With BPA
1943-1944
6/6
Capability Studies - System
1950
6/7
Capability Studies - Total System
1947-1950
6/8
Capability Studies - Total System
1947-1950
6/9
Capability Data
1930-1948
6/10
Seattle and Tacoma Systems Computed Demands
1937-1952
6/11
Seattle and Tacoma Systems Computed Demands
1937-1952
6/12
Priest Rapids Critical Year Capability
1963-1964
6/13
Capability Studies - Ross
1947-1950
6/14
System Capability, Without Ross Dam
1937-1942
6/15
System Capability, With Ross Dam To 1380'
1942-1943
6/16
System Capability, With Ross Dam To 1525'
1942-1947
6/17
System Capability, Ross Dam To Various Elevations
1937-1945
6/18
System Capability, Ross Dam To Various Elevations
1930-1949
6/19
System Capability, Ross Dam To Various Elevations
1950
6/20
System Capability, Ross Dam To Various Elevations
1949-1950
6/21
System Capability, Ross Dam To Various Elevations
1949
6/22
System Capability, Ross Dam To Various Elevations
1944-1950
6/23
System Capability, Ross Dam To Various Elevations
1937-1944
6/25
System Capability, Ross Dam To Various Elevations
1937-1951
6/26
System Capability Without Ross Dam
1934-1940
6/27
System Capability, With Ross To 1380'
1939-1941
6/28
System Capability, With Ross Dam To 1525'
1942
6/29
System Capability, With Ross Dam To 1600'
1946
6/30
System Capability, With Ross Dam To 1630'
1944
6/31
High Ross Dam and Columbia River Study Summaries
1962
6/32
High Ross Dam Capability Study Coordinated With Base System Study
1962
6/33
High Ross Dam and Columbia River Study
1962
6/34
Columbia, Kootenay, Pend Oreille and Skagit Rivers Regulation
1962
7/1
Loss Incurred by Coordination Agreement
1963-1964
7/2
Coordination Study of Federal - Tacoma Hydro Systems
1963
7/3
Northwest Power Pool Hydro Probability Study
1963
7/4
Northwest Power Pool Hydro Probability Study
1964
7/5
Northwest Power Pool Hydro Probability Study
1964
7/6
Northwest Power Pool Hydro Probability Study
1964
8/1
Load Computations and System Load Data
1936-1941
9/1
Boundary Base Duration Curves
1961-1971
9/2
System Power Study - Base System (Sequence VI)
1960
9/3
Power Study - Base System (Sequence VI) - BPA
1958
9/4
Power Study - Base System Plus Mica, Arrow Lakes, and Duncan Lake, BPA
1960
9/5
Power Study - Sequence III-J Columbia River Base System With Mica, High Arrow Lakes and Duncan Lake
1960
9/6
Power Study - Columbia River Base System Plus
1960
9/7
Power Study - Hydro Regulation 75-14 U.S. Storage Only
1964
9/8
Power Study - Hydro Regulation 75-11 U.S. Storage Only
1964
10/1
Discharge Data - Sauk River Above Whitechuck, 1912-1982
undated
10/2
Discharge Data - Wynoochee River / Lake, 1966-1982
undated
10/3
Discharge Data - Calawah River Near Forks, 1898-1979
undated
10/4
Discharge Data - Hoh River At US 101, 1961-1979
undated
10/5
Discharge Data - Soleduck River Near Fairholm, 1918-1980
undated
10/6
Discharge Data - Trout Lake Creek, 1910-1969
undated
10/7
Discharge Data - White Salmon River, 1959-1969
undated
10/8
Discharge Data - White Salmon River, 1957-1979
undated
10/9
Seattle and Tacoma Systems Computed Demand Studies, 1961-1976
undated
10/10
Computer Studies Tabulations
1955-1958
10/11
Seattle and Tacoma BPA Computed Demands, 1961-1976
1961
10/12
Northwest Power Pool 1960-1961 Hydro Probability Study
1960
10/13
Study of Skagit and Boundary Capabilities, Water years 1928-1948
1959
10/14
Study of Skagit and Boundary Capabilities, Water years 1928-1948
1959
11/1
Discharge Data - Dewatto, 1959-1981
undated
11/2
Discharge Data - Dow Creek, 1950-1954
undated
11/3
Discharge Data - Nooksack River, 1956-1979
undated
11/4
Discharge Data - Bacon Creek, 1943-1950
undated
11/5
Discharge Data - Skookum Creek Near Wickersham, 1950-1969
undated
11/6
Discharge Data - Big Quilcene River, 1971-1981
undated
11/7
Discharge Data - South fork Tolt River, 1961-1981
undated
11/8
Discharge Data - Morse Creek Near Port Angeles, 1967-1979
undated
11/9
Discharge Data - Snow Creek, 1952-1979
undated
11/10
Discharge Data - North Fork Stillaguamish, 1928-1979
undated
11/11
Discharge Data - Pend Oreille River Near International Boundary, 1967-1983
undated
11/12
Power Study
1985
11/13
Power Study
1984

Names and SubjectsReturn to Top

  • Subject Terms :
  • Cedar River (King County, Wash.)
  • Electric power--Washington--Seattle
  • Pend Oreille River
  • Reservoirs--Washington (State)
  • Rivers--Washington (State)
  • Ross Dam (Wash.)
  • Skagit River (B.C. and Wash.)
  • Skagit River Hydroelectric Project
  • Streamflow--Washington (State)
  • Corporate Names :
  • Seattle City Light
  • Seattle (Wash.). Lighting Dept.
  • Tacoma (Wash.). Dept. of Public Utilities
  • Geographical Names :
  • Seattle (Wash.)