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Minidoka Project
Minidoka Project | Project History | Project Data | Contact Information

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



Project # 17


Land Areas (1992)
Irrigable area:
Full Irrigation Service1,111,178 acres
Supplemental Service0 acres
Temporary Irrigation Service0 acres
Number of Irrigated Farms18,168
Residential, Commercial, Industrial Lands57,688 acres
Total Irrigable Lands1,168,866 acres


Population Served
Farm Population Served75,170
Non-Farm Population Served136,633
Total Population Served211,803


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Area Irrigated and Crop Value
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 Upper Snake River Basin

Weather Conditions (NOAA)



Snake River near Heise, Idaho (USGS)
Snake River near Blackfoot, Idaho (USGS)
Henrys Fork near Island Park, Idaho (USGS)
Snake River Gaging Station at Milner, ID (USGS)

Streamflow Forecast Map

Spring and Summer (NRCS)

Snowpack Information

Mountain Snowpack Maps for Columbia River Basin
Columbia River Snowpack Summary

Drought Index

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


Historic Conditions

Annual Precipitation
Normal12.14 in
Maximum - 198320.33 in
Minimum - 19665.34 in
Pocatello, Idaho 1961-1990 


Mean Annual46.7 ?F
Daily Maximum - 08/02/1969104 ?F
Daily Minimum - 02/01/1985-33 ?F
Pocatello, Idaho 1939-1996 
Growing Season155 days
Elevation of irrigable area4,225 - 5,000 ft


Snake River
Drainage area near Heise, Idaho5,752 sq mi
Annual discharge: 
Maximum - 19717,595,419 acre-ft
Minimum - 19342,877,098 acre-ft
Average - 1910-19965,017,431 acre-ft


Henrys Fork - Island Park Dam
Drainage area at Island Park Dam481 sq mi
Annual discharge: 
Maximum - 1984756,691 acre-ft
Minimum - 1934274,394 acre-ft
Average - 1933-1996441,547 acre-ft


Grassy Creek
Drainage area at Grassy Lake Dam10 sq mi
Estimated average annual runoff5,700 acre-ft

No gaging station available on this tributary.


Snake River - American Falls

Drainage area at American Falls Dam13,580 sq mi
Annual inflow: 
Maximum - 19717,361,561 acre-ft
Minimum - 1934533,927 acre-ft
Average - 1910-19963,454,933 acre-ft


Snake River - Milner Dam
Drainage area near Milner, Idaho17,180 sq mi
Annual discharge: 
Maximum - 19846,791,683 acre-ft
Minimum - 1934117,004 acre-ft
Average - 1909-19962,304,236 acre-ft

Streamflows: Snake River at Milner, Idaho (USGS)


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Project Water Quality

American Falls


Big Wood

Idaho Falls

Lake Walcott

Little Wood

Lower Henrys



Upper Henrys

Upper Snake - Rock


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



Facilities in Operation
Facilities in Operation
Storage Dams3
Diversion Dams3
Canals1,662 mi
Laterals3,929 mi
Pumping Plants4
Irrigation wells177
Transmission Lines3.4 mi


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Storage Facilities

American Falls Dam

Grassy Lake Dam

Island Park Dam

Jackson Lake Dam

Minidoka Dam


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Diversion Facilities
Cross Cut Diversion Dam
Type:Concrete gravity weir, ogee overflow
LocationOn Henrys Fork near Chester, Idaho
Year Completed1938
Structural height17 ft
Hydraulic height10 ft
Weir crest length355 ft
Total length457 ft
Crest elevation5,040.5 ft
Volume7,400 cu yd
Diversion capacity591 cfs


Cascade Creek Diversion Dam
Type:Rockfilled log crib weir
LocationOn Cascade Creek, 25 miles northwest of Moran, Wyoming
Year Completed1937
Structural height14 ft
Hydraulic height6 ft
Weir crest length140 ft
Total length217 ft
Crest elevation7,315.0 ft
Weir crest elevation7,310.0 ft
Volume3,000 cu yd
Diversion capacity220 cfs


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Carriage Facilities
Miller-Gooding Canal
LocationFrom Milner Diversion Dam on the Snake River northwest about 50 miles to vicinity of Gooding, Idaho.
Construction period1928-1932
Length70 mi
Diversion capacity2,700 cfs
Typical section, concrete lined 
Bottom width20 ft
Side slopes0.25:1
Water depth13.8 ft
Typical section in earth: 
Bottom width50 ft
Side slopes1.25:1
Water depth12.6 ft


Cross Cut Canal
LocationFrom Cross Cut Diversion Dam south about 6 miles to the Teton River.
Construction period1936-1938
Total length6.6 mi
Diversion capacity591 cfs
Typical section in earth: 
Bottom width26 ft
Side slopes1.5:1
Water depth5.7 ft


Cascade Diversion Canal
LocationFrom Cascade Creek Diversion Dam to natural channel leading to Grassy Lake Reservoir.
Construction period1937
Total length0.7 mi
Diversion capacity220 cfs
Typical section in earth: 
Bottom width10 ft
Side slopes1.5:1
Water depth5 ft


South Side Canal
LocationFrom Minidoka Dam south-southwest about 12 miles to first lift pumping plant.
Construction period1905 - 1907
Total length13 mi
Diversion capacity1,325 cfs
Typical section in earth: 
Bottom width57 ft
Side slopes1.25:1
Water depth7.5 ft


North Side Canal
LocationFrom Minidoka Dam west-southwest to a point about 5 miles north of the Snake River.
Construction period1905 - 1907
Total length8 mi
Diversion capacity1,700 cfs


Unit `A` Main Canal - North Side Pumping Division
LocationExtends northeast from a point on the Snake River to about 8 miles west of Burley, Idaho.
Construction period1945 - 1955
Total length4.4 mi
Diversion capacity240 cfs
Typical section in earth: 
Bottom width14 ft
Side slopes2:1
Water depth4.5 ft
Typical section, unlined: 
Bottom width12 ft
Side slopes1.5:1
Water depth5 ft


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Pumping Plants
DesignationNumber of unitsTotal capacity, cfsTotal dynamic head, ftTotal horsepower
South Side Pumping Division:    
Lift No. 161,011314,040
Lift No. 26891343,590
Lift No. 33453312,340
North Side Pumping Division:    
Unit A52401686,000
Unit B1771,128129-34538,000


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Power Facilities

Minidoka Powerplant

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Last updated: Jan 03, 2013