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Okanogan Project
Okanogan Project | Project History | Project Data | Contact Information

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

 

  

Project # 21

Land Areas (1992)
Irrigable area:
Full Irrigation Service4,917 acres
Supplemental Service0 acres
Temporary Irrigation Service0 acres
Number of Irrigated Farms242
Residential, Commercial, Industrial Lands121 acres
Total Irrigable Lands5,038 acres

 

Population Served:
Farm Population Served764
Non-Farm Population Served420
Total Population Served1,184

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Area Irrigated and Crop Value
YearActual Area Irrigated (Acres)Crop Value (Dollars)
19833,8914,230,720
19843,8886,028,710
19853,8833,074,612
19863,8834,655,307
19874,1975,422,184
19884,0207,179,900
19894,3225,863,508
19904,3175,715,320
19914,2469,136,440
19924,2469,119,490

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Project Water Supply
Project Water Quality

 

   

Project Water Supply

Current Conditions

Current Weather (NOAA)

Precipitation

Streamflow

Okanogan River at Malott, Washington (USGS)

Streamflow Forecast Map

Spring and Summer (NRCS)

Snowpack Information

Columbia River Snowpack Summary
Mountain Snowpack Maps for Columbia Basin

Drought Index

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

 


Historic Conditions

Annual Precipitation
Normal15.05 in
Maximum - 198328.72 in
Minimum - 19857.05 in
Conconully, Washington 1961-1990 

 

Temperature
Mean Annual45.4 ?F
Daily Maximum - 07/18/1979102 ?F
Daily Minimum - 12/28/1968-31 ?F
Conconully, Washington 1948-1996 
Growing Season168 days
Elevation of irrigable area1,000.0 ft

 

Salmon Creek
Drainage area above Conconully Dam119 mi2
Annual discharge at Malott: 
Maximum - 19724,592,392 acre-ft
Minimum - 19771,039,352 acre-ft
Average - 1965-19962,191,959 acre-ft

Streamflows:

Salmon Creek near Conconully, Washington (USGS)

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Project Water Quality

Okanogan River

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Facilities in Operation
Storage Facilities
Diversion Facilities
Carriage Facilities
Pumping Plants

 

   

Facilities in Operation
Storage Dams2
Diversion Dams1
Canals20 mi
Laterals43 mi
Pumping Plants2

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Storage Facilities

Conconully Dam

Salmon Lake Dam

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Diversion Facilities
Type:Concrete ogee weir, embankment wing
LocationOn Salmon Creek about 4 miles northwest of Okanogan, Washington.
Year Completed1906
Dimensions: 
Structural height6ft
Hydraulic height5ft
Weir crest length50 ft
Crest elevation1,376.0 ft
Length140 ft
Spillway:Overflow weir
Capacity300 cfs
Headworks:6-ft-wide concrete with hand-operated wooden control gate.
Diversion capacity100 cfs

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Carriage Facilities
Main Canal
LocationFrom Salmon Creek Diversion Dam southeasterly.
Construction period1911-1917. Partially relined in 1936, and 1950
Length2 mi
Diversion capacity100 cfs
Typical section in earth: 
Bottom width10 ft
Side slopes1.5:1
Water depth3 ft
Typical section, concrete lined: 
Bottom width5 ft
Side slopes1.5:1
Water depth3 ft
Lining thickness1.5 in

High Line Canal

LocationFrom the end the of the Main Canal 1 mile north of Okanogan, Washington, then northeasterly.
Construction period1911-1917. Partially relined 1935-1940
Length12 mi
Typical section in earth: 
Bottom width10 ft
Side slopes1.5:1
Water depth3 ft
Typical section, concrete lined: 
Bottom width5 ft
Side slopes1.25:1
Water depth2 ft
Lining thickness3 in

 

Low Line Canal
LocationFrom the end of the Main Canal 2 miles north of Okanogan, Washington, then northeasterly.
Construction period1911-1917
Length6 mi
Typical section, concrete lined: 
Bottom width3 ft
Side slopes1.5:1
Water depth1.5 ft
Lining thickness1.5 ft

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Pumping Plants
DesignationNumber of unitsTotal capacity, cfsTotal dynamic head, ftTotal horsepower
Shell Rock Point Pumping Plant4336203,200
Duck Lake11015-40125

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Last updated: May 11, 2011