Project details - Minidoka Project - Bureau of Reclamation

Full Irrigation Service	1,111,178 acres
Supplemental Service	0 acres
Temporary Irrigation Service	0 acres
Number of Irrigated Farms	18,168
Residential, Commercial, Industrial Lands	57,688 acres
Total Irrigable Lands	1,168,866 acres

Population Served

Farm Population Served	75,170
Non-Farm Population Served	136,633
Total Population Served	211,803

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Area Irrigated and Crop Value

Year	Actual Area Irrigated (Acres)	Crop Value (Dollars)
1983	1,008,299	473,974,240
1984	1,046,029	415,864,248
1985	1,052,735	337,793,992
1986	1,042,843	390,389,846
1987	1,043,579	416,226,458
1988	1,044,636	515,792,022
1989	1,069,875	571,245,097
1990	1,059,564	541,082,025
1991	1,059,397	456,557,702
1992	1,062,093	462,684,605

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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)

Precipitation

Streamflow

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

Normal	12.14 in
Maximum - 1983	20.33 in
Minimum - 1966	5.34 in
Pocatello, Idaho 1961-1990

Temperature

Mean Annual	46.7 ?F
Daily Maximum - 08/02/1969	104 ?F
Daily Minimum - 02/01/1985	-33 ?F
Pocatello, Idaho 1939-1996
Growing Season	155 days
Elevation of irrigable area	4,225 - 5,000 ft

Snake River

Drainage area near Heise, Idaho	5,752 sq mi
Annual discharge:
Maximum - 1971	7,595,419 acre-ft
Minimum - 1934	2,877,098 acre-ft
Average - 1910-1996	5,017,431 acre-ft

Henrys Fork - Island Park Dam

Drainage area at Island Park Dam	481 sq mi
Annual discharge:
Maximum - 1984	756,691 acre-ft
Minimum - 1934	274,394 acre-ft
Average - 1933-1996	441,547 acre-ft

Grassy Creek

Drainage area at Grassy Lake Dam	10 sq mi
Estimated average annual runoff	5,700 acre-ft

No gaging station available on this tributary.

Snake River - American Falls

Drainage area at American Falls Dam	13,580 sq mi
Annual inflow:
Maximum - 1971	7,361,561 acre-ft
Minimum - 1934	533,927 acre-ft
Average - 1910-1996	3,454,933 acre-ft

Snake River - Milner Dam

Drainage area near Milner, Idaho	17,180 sq mi
Annual discharge:
Maximum - 1984	6,791,683 acre-ft
Minimum - 1934	117,004 acre-ft
Average - 1909-1996	2,304,236 acre-ft

Streamflows: Snake River at Milner, Idaho (USGS)

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Project Water Quality

Facilities in Operation

Facilities in Operation

Storage Dams	3
Diversion Dams	3
Canals	1,662 mi
Laterals	3,929 mi
Pumping Plants	4
Irrigation wells	177
Drains	1,249
Powerplants	1
Transmission Lines	3.4 mi
Substations	184

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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
Location	On Henrys Fork near Chester, Idaho
Year Completed	1938
Dimensions:
Structural height	17 ft
Hydraulic height	10 ft
Weir crest length	355 ft
Total length	457 ft
Crest elevation	5,040.5 ft
Volume	7,400 cu yd
Diversion capacity	591 cfs

Cascade Creek Diversion Dam

Type:	Rockfilled log crib weir
Location	On Cascade Creek, 25 miles northwest of Moran, Wyoming
Year Completed	1937
Dimensions:
Structural height	14 ft
Hydraulic height	6 ft
Weir crest length	140 ft
Total length	217 ft
Crest elevation	7,315.0 ft
Weir crest elevation	7,310.0 ft
Volume	3,000 cu yd
Diversion capacity	220 cfs

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Carriage Facilities

Miller-Gooding Canal

Location	From Milner Diversion Dam on the Snake River northwest about 50 miles to vicinity of Gooding, Idaho.
Construction period	1928-1932
Length	70 mi
Diversion capacity	2,700 cfs
Typical section, concrete lined
Bottom width	20 ft
Side slopes	0.25:1
Water depth	13.8 ft
Typical section in earth:
Bottom width	50 ft
Side slopes	1.25:1
Water depth	12.6 ft

Cross Cut Canal

Location	From Cross Cut Diversion Dam south about 6 miles to the Teton River.
Construction period	1936-1938
Total length	6.6 mi
Diversion capacity	591 cfs
Typical section in earth:
Bottom width	26 ft
Side slopes	1.5:1
Water depth	5.7 ft

Cascade Diversion Canal

Location	From Cascade Creek Diversion Dam to natural channel leading to Grassy Lake Reservoir.
Construction period	1937
Total length	0.7 mi
Diversion capacity	220 cfs
Typical section in earth:
Bottom width	10 ft
Side slopes	1.5:1
Water depth	5 ft

South Side Canal

Location	From Minidoka Dam south-southwest about 12 miles to first lift pumping plant.
Construction period	1905 - 1907
Total length	13 mi
Diversion capacity	1,325 cfs
Typical section in earth:
Bottom width	57 ft
Side slopes	1.25:1
Water depth	7.5 ft

North Side Canal

Location	From Minidoka Dam west-southwest to a point about 5 miles north of the Snake River.
Construction period	1905 - 1907
Total length	8 mi
Diversion capacity	1,700 cfs

Unit `A` Main Canal - North Side Pumping Division

Location	Extends northeast from a point on the Snake River to about 8 miles west of Burley, Idaho.
Construction period	1945 - 1955
Total length	4.4 mi
Diversion capacity	240 cfs
Typical section in earth:
Bottom width	14 ft
Side slopes	2:1
Water depth	4.5 ft
Typical section, unlined:
Bottom width	12 ft
Side slopes	1.5:1
Water depth	5 ft

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Pumping Plants

Designation	Number of units	Total capacity, cfs	Total dynamic head, ft	Total horsepower
South Side Pumping Division:
Lift No. 1	6	1,011	31	4,040
Lift No. 2	6	891	34	3,590
Lift No. 3	3	453	31	2,340
North Side Pumping Division:
Unit A	5	240	168	6,000
Unit B	177	1,128	129-345	38,000

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Power Facilities

Minidoka Powerplant

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Last updated: Jan 03, 2013