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Umatilla Basin Project
Umatilla Basin Project | Project History | Project Data | Contact Information

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



Project # 31

Land Areas (1992)
Irrigable area:
Full Irrigation Service13,679 acres
Supplemental Service12,499 acres
Temporary Irrigation Service0 acres
Number of Irrigated Farms1,213
Residential, Commercial, Industrial Lands4,405 acres
Total Irrigable Lands30,583 acres


Population Served:
Farm Population Served5,563
Non-Farm Population Served11,952
Total Population Served17,515

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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 the Umatilla River Basin

Weather Conditions (NOAA)

Foothills of the Blue Mountains, Oregon
Lower Columbia Basin, Oregon



Umatilla River near Umatilla, Oregon (USGS)
Umatilla River at West Reservation Boundary near Pendleton (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 Drouht Severity Index (Text)


Historic Conditions

Annual Precipitation
Normal16.30 in
Maximum - 198323.37 in
Minimum - 196711.52 in
Pendleton, Oregon 1961-1990 


Mean Annual50.5 ?F
Daily Maximum - 08/04/1961115 ?F
Daily Minimum - 01/26/1957-30 ?F
Pendleton, Oregon 1956-1996 
Growing Season187 days
Elevation of irrigable area470 ft


Umatilla River
Drainage area at Yoakum, Oregon1,280 mi2
Annual discharge: 
Maximum - 1917804,391 acre-ft
Minimum - 1966257,519 acre-ft
Average - 1903-1996487,526 acre-ft


Umatilla River at Yoakum, Oregon

McKay Creek
Drainage area at Pilot Rock,Oregon186 mi2
Annual discharge: 
Maximum - 1984128,805 acre-ft
Minimum - 197730,294 acre-ft
Average - 1918-199171,017 acre-ft

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Project Water Quality

Umatilla River

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Facilities in Operation
Storage Facilities
Diversion Facilities
Carriage Facilities
Pumping Plants



Facilities in Operation
Storage Dams2
Diversion Dams3
Canals137 mi
Laterals106 mi
Pumping Plants5
Drains14 mi

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Storage Facilities

Cold Springs Dam

McKay Dam


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Diversion Facilities
Feed Canal Diversion
Type:Concrete, rock, and timber weir with embankment wing
LocationOn the Umatilla River, 1.5 miles southeast of Echo, Oregon.
Year Completed1907
Strucural height8 ft
Hydraulic height4 ft
Crest length2,100 ft
Crest elevation656.0 ft
Volume14,100 yd3
Diversion capacity350 cfs


Maxwell Diversion
Type:Concrete and timber-crib weir with embankment wing
LocationOn the Umatilla River, 1 mile west of Hinkle, Oregon.
Year Completed1912
Strucural height14 ft
Hydraulic height4 ft
Crest length400 ft
Crest elevation529.0 ft
Volume500 yd3
Diversion capacity140 cfs

Three Mile Falls Diversion Dam


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Carriage Facilities
Feed Canal
LocationFrom Feed Canal Diversion Dam generally northwest along the Umatilla River about 8 miles, then northeast to Cold Springs Reservoir.
Construction period1906-1907. Enlarged 1913-1917
Length25 mi
Diversion capacity350 cfs
Typical section in earth: 
Bottom width23 ft
Side slopes1.5:1
Water depth5.5 ft


West Extension Main Canal
LocationFrom Three Mile Falls Diversion Dam generally west about 20 miles along the Columbia River.
Construction period1913-1916
Length27 mi
Diversion capacity140 cfs


Maxwell Canal
LocationFrom Umatilla River northeast to vicinity of Cold Springs Reservoir.
Construction periodNon-Reclamation construction. Enlarged in 1917 by Bureau of Reclamation.
Length10 mi
Diversion capacity140 cfs

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Pumping Plants
DesignationNumber of unitsTotal capacity, cfsTotal dynamic head, ftTotal horsepower
Columbia River628233512,000
Cold Springs6158631,500
West Extension Irrigation District5147972,400

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Last updated: Jan 03, 2013