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Shasta/Trinity River Division Project
Shasta/Trinity Project | Project History | Project Data | Contact Information

Project Data
Land Areas (1992)
Area Irrigated and Crop Value

 

  

Project # 1741/416

 

Land Areas (1992)
Irrigable area:
Full Irrigation Serviceacres
Supplemental Service459,936 acres
Temporary Irrigation Service0 acres
Number of Irrigated Farms3,621
Residential, Commercial, Industrial Landsacres
Total Irrigable Landsacres

 

Population Served
Farm Population Served 
Non-Farm Population Served 
Total Population Served 

 

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Area Irrigated and Crop Value
Shasta Division
YearActual Area Irrigated (Acres)Crop Value (Dollars)
1983354,360151,984,128
1984334,813186,014,668
1985321,078176,765,468
1986301,396182,174,552
1987278,730158,375,328
1988343,861200,843,074
1989365,515244,127,717
1990352,604259,509,653
1991316,137252,897,097
1992320,449215,088,494

 

Trinity River Division
YearActual Area Irrigated (Acres)Crop Value (Dollars)
19835,3123,026,184
19845,7263,375,693
19855,8242,576,975
19865,8842,689,716
19874,6691,412,216
19884,7351,574,951
19896,3011,954,031
19906,2612,362,691
19916,2692,136,639
19925,9892,411,887

 

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Project Water Supply
Project Water Quality

 

   

 

Project Water Supply

Current Conditions

Reservoir Storage
Streamflow
Streamflow Forecast Map

Spring and Summer (NRCS)
Snowpack Information

Mountain Snowpack Maps for Great Basin & California
Drought Index

Palmer Drought Index Map
Explanation of Palmer Drought Severity Index (Text)

 


Historic Conditions

Annual Precipitation
Normal61.47 in
Maximum - 1983134.43 in
Minimum - 197627.98 in
Whiskeytown Reservoir 1961-1990 

 

Temperature
Mean Annual72.9 ?F
Daily Maximum - 08/08/1981115 ?F
Daily Minimum - 12/21/199011 ?F
Whiskeytown Reservoir, 1960-1996 
Growing Season150 days
Elevation of irrigable area550 ft

 

Sacramento River
Drainage area at Shasta Dam6,665 sq mi
Annual discharge: 
Maximumacre-ft
Minimumacre-ft
Averageacre-ft

 

Streamflows: Sacramento River at Delta, California (USGS)
Daily Flows: California Data Exchange Center -- Shasta Dam Outflows
Trinity River
Drainage area at Island Park Dam719 sq mi
Annual discharge: 
Maximumacre-ft
Minimumacre-ft
Averageacre-ft

 

http://waterdata.usgs.gov/nwis-w/CA/?statnum=11525500

http://cdec.water.ca.gov/cgi-progs/queryLonger?3089

Clear Creek
Drainage area at Island Park Dam228 sq mi
Annual discharge: 
Maximumacre-ft
Minimumacre-ft
Averageacre-ft

 

Daily Flows: California Data Exchange Center -- Whiskeytown Dam Outflows

 

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Project Water Quality

Lower Pit

McCloud

Sacramento - Headwaters

Sacramento - Upper Clear

Trinity

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Facilities in Operation
Storage Facilities
Diversion Facilities
Carriage Facilities
Pumping Plants
Power Facilities

 

   

 

Facilities in Operation
Facilities in Operation
Storage Dams6
Conduits and aqueducts16.3 mi
Tunnels13.3 mi
Pumping Plants1
Powerplants5
Transmission Lines11.99 mi
Substations6

 

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Storage Facilities

Keswick Dam

 

Shasta Dam

Spring Creek Debris Dam

Trinity Dam

Whiskeytown Dam

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Diversion Facilities
  
  
  
  
  

 

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Carriage Facilities
Clear Creek South Main Aqueduct
Construction period1965-1967
Length8.5 mi
Capacity73 cfs
Cross section:Circular
Lining typeSteel and concrete
Diameter3.5-3.75 ft

 

Cow Creek Main Aqueduct
Construction period1965-1967
Length7.8 mi
Capacity92 cfs
Cross section:Circular
Lining typePretensioned reinforced concrete
Diameter4.5 ft

 

Spring CreekTunnel
LocationFrom the east side of Whiskeytown Lake easterly through Rock Creek Siphon, then to the Spring Creek Powerplant.
Construction period1960-1963
Length2.4 mi
Capacity3,600 cfs
Cross section:Circular
Diameter18.5 ft
Lining typeConcrete

 

Lining thickness

 

Clear CreekTunnel
LocationFrom Lewiston Reservoir near Lewiston Dam southeasterly to Judge Francis Carr Powerhouse and Whiskeytown Lake.
Construction period1957-62
Length10.7 mi
Capacity3,200 cfs
Cross section:Circular
Diameter17.5 ft
Lining typeConcrete
Lining thickness9-37 in

 

Spring Creek Powerplant Tailrace Tunnel
Construction period1960-1962
Length567 ft
Capacity3,600 cfs
Cross section:Horseshoe
Lining typeConcrete
Diameter21 ft

 

Judge Francis Carr Powerhouse Bypass
Construction period1969-1970
Length270 ft
Capacity1,600 cfs
Cross section:Circular
Diameter6 ft
Lining typeConcrete
Lining thickness9 in

 

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Pumping Plants
DesignationNumber of unitsTotal capacity, cfsTotal dynamic head, ftTotal horsepower
Wintu41002954,000

 

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Power Facilities

Judge Francis Carr Powerplant

Lewiston Powerplant

Keswick Powerplant

Shasta Powerplant

Spring Creek Powerplant

Trinity Powerplant - Includes Lewiston Powerplant

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Last updated: Apr 21, 2011