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Owyhee Project
Owyhee Project | Project History | Project Data | Contact Information

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



Project # 48

Land Areas (1992)
Irrigable area:
Full Irrigation Service104,658 acres
Supplemental Service12,900 acres
Temporary Irrigation Service0 acres
Number of Irrigated Farms1,923
Residential, Commercial, Industrial Lands691 acres
Total Irrigable Lands118,249 acres


Population Served:
Farm Population Served4,641
Non-Farm Population Served4,875
Total Population Served9,516

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Area Irrigated and Crop Value
YearActual Area Irrigated (Acres)Crop Value (Dollars)

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Project Water Supply
Project Water Quality



Project Water Supply

Current Conditions

Reservoir Storage

Major Storage Reservoirs in Southeastern Oregon

Weather Conditions (NOAA)


Owyhee River below Owyhee Dam, Oregon (USGS)
Streamflow Forecast Map

Spring and Summer (NRCS)
Snowpack Information

Columbia River Snowpack Summary
Mountain Snowpack Maps for Columbia River Basin
Drought Index

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


Historic Conditions

Annual Precipitation
Normal11.07 in
Maximum = 198320.03 in
Minimum = 19665.89 in
Payette, Idaho 1961-1990 


Mean Annual51.4 ?F
Daily Maximum - 07/12/1967109 ?F
Daily Minimum - 01/22/1962-26 ?F
Payette, Idaho 1948-1996 
Growing Season192 days
Elevation of irrigable area2,250 - 2,500 ft


Owyhee River
Drainage area above Owyhee Reservoir10,400 mi2
Annual discharge: 
Maximum = 19431,078,732 acre-ft
Minimum = 1931151,307 acre-ft
Average - 1930-1952634,110 acre-ft


Owyhee River above Owyhee Reservoir, Oregon (USGS)

Drainage area above Owyhee Dam11,160 mi2
Annual discharge: 
Maximum = 19842,187,767 acre-ft
Minimum = 1948150,009 acre-ft
Average - 1932-1996302,179 acre-ft

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Project Water Quality

Lower Owyhee

Middle Snake - Payette

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Facilities in Operation
Storage Facilities
Carriage Facilities
Pumping Plants



Facilities in Operation
Storage Dams1
Canals172 mi
Laterals543 mi
Pumping Plants9
Drains227 mi
Transmission Lines 19.4 mi

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Storage Facilities

Owyhee Dam

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Carriage Facilities
North Canal
LocationFrom Lake Owyhee north about 65 miles to the Snake River across from Weiser, Idaho.
Construction period1930-1936
Total length61.5 mi
Diversion capacity1,190 cfs
Typical section in earth: 
Bottom width24 ft
Side slopes1.5:1
Water depth10.9 ft
Typical section, concrete lined 
Bottom width10.2 ft
Side slopes1.25:1
Water depth10 ft
Lining thickness4 in


North Canal Tunnel No. 1
LocationFrom Lake Owyhee near the dam, 3.5 miles northeast to Tunnel Canyon.
Construction period1930-1932
Length3.5 mi
Capacity1,840 cfs
Diameter16.58 ft
Cross section:Horseshoe
Concrete lining8-16 in


Malheur River Siphon - North Canal
LocationIn the valley of the Malheur River near Ontario, Oregon.
Construction period1935
Length4.3 mi
Capacity325 cfs
Diameter (inside)6.67 ft
Maximum head283 ft
Material:Plate steel


South Canal
LocationFrom the end of North Canal Tunnel No.1 to Snake River opposite Marsing, Idaho.
Construction period1930-1936
Total length37 mi
Diversion capacity490 cfs
Typical section in earth: 
Bottom width16 ft
Side slopes1.5:1
Water depth7 ft


South Canal Tunnel No. 5
LocationFrom the end of North Canal Tunnel No. 1, southeast.
Construction period1930-1932
Length4.2 mi
Capacity650 cfs
Horseshoe section9.25 ft
Circular section9.5 ft
Lining6-10 in

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Pumping Plants
DesignationNumber of unitsTotal capacity, cfsTotal dynamic head, ftTotal horsepower
Mitchell Butte Division:    
Owyhee Ditch3222501,500
Dead Ox Flat Division:    
Dead Ox517650-1112,675
Succor Creek Division:1    
Succor Creek No. 111561---
Succor Creek No. 211566---
Gem District:    
Kingman Colony District:    
Kingman Colony164440

1 Succor Creek No.1 and No. 2 are direct-connected hydraulic powered units. Other plants are supplied power from Boise Project powerplants.

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Last updated: Jan 03, 2013