Minidoka Dam, Idaho, USA

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Quick Facts About Minidoka Dam

Location: Minidoka, Idaho
Coordinates: 42.6691, -113.4842
River: Snake River Columbia River
Primary Purpose: Fish and Wildlife Pond
Type: Earth
Commissioned: 1906
Dam Height: 88 ft (27 m)
Dam Length: 670 ft (204 m)
Dam Capacity: 220,200 acre-ft (271,612 Ml)
Condition Assessment: Not Available

Minidoka Dam Map

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Minidoka Dam Information

Minidoka Dam is an earthen embankment dam located about 6 miles from Rupert, Minidoka, Idaho.

The dam, which is on the Snake River Columbia River, was primarily built for Fish and Wildlife Pond purposes, but also serves for Recreation, Hydroelectric and Water Supply benefits.

The dam was designed by US Bureau of Reclamation and commissioned in 1906 and is currently owned by US Bureau of Reclamation.

Minidoka Dam Structure

The Minidoka Dam is approximately 670 feet (204 m) long, 88 feet (27 m) high and has a structural volume of 257,300 cubic yards (196,720 cubic metres).

Minidoka Dam Storage Capacity & Surface Area

The reservoir has a normal storage capacity of 210,200 acre-ft (259,277 Ml) and maximum capacity of 220,200 acre-ft (271,612 Ml).

The surface area of the reservoir is 12,400 acres (5,018 ha) and the total catchment area is 15,625 square miles (40,469 square kilometres).

Minidoka Dam Spillway

The dam has a 2142 feet (653 m) wide controlled spillway with a maximum discharge capacity of 40552 cubic feet per second (1148 cubic metres per second).

Minidoka Dam Compared to Four Famous American Dams

Minidoka Dam
Minidoka, Idaho
Hoover Dam
Clark County, Nevada
Grand Coulee Dam
Okanogan County, Washington
Theodore Roosevelt Dam
Maricopa County, Arizona
Glen Canyon Dam
Coconino County, Arizona
Height (ft) 88 730 550 357 216
Length (Ft) 670 1,244 5,673 6,920 1,565
Storage Volume (acre-ft) 220,200 30,237,000 9,562,000 3,540,000 29,875,000
Drainage Area (sq miles) 15,625 167,800 74,100 3,611 108,355

Minidoka Dam Weather

Current Conditions at Minidoka Dam

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7-Day Forecast for Minidoka Dam

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Minidoka Dam Frequently Asked Questions

In which state is the Minidoka Dam?

Minidoka Dam is in Idaho.

In which county is the Minidoka Dam?

Minidoka Dam is in Minidoka County.

How high is the Minidoka Dam?

Minidoka Dam is 88 feet high.

How long is the Minidoka Dam?

Minidoka Dam is 670 feet long.

Condition Assessment Classification

Satisfactory

No existing or potential dam safety deficiencies are recognized. Acceptable performance is expected under all loading conditions (static, hydrologic, seismic) in accordance with the minimum applicable state or federal regulatory criteria or tolerable risk guidelines.

Fair

No existing dam safety deficiencies are recognized for normal operating conditions. Rare or extreme hydrologic and/or seismic events may result in a dam safety deficiency. Risk may be in the range to take further action. Note: Rare or extreme event is defined by the regulatory agency based on their minimum

Poor

A dam safety deficiency is recognized for normal operating conditions which may realistically occur. Remedial action is necessary. POOR may also be used when uncertainties exist as to critical analysis parameters which identify a potential dam safety deficiency. Investigations and studies are necessary.

Unsatisfactory

A dam safety deficiency is recognized that requires immediate or emergency remedial action for problem resolution.

Not Rated

The dam has not been inspected, is not under state or federal jurisdiction, or has been inspected but, for whatever reason, has not been rated.

Not Available

Dams for which the condition assessment is restricted to approved government users.

Hazard Potential Classification

High

Dams assigned the high hazard potential classification are those where failure or mis-operation will probably cause loss of human life.

Significant

Dams assigned the significant hazard potential classification are those dams where failure or mis-operation results in no probable loss of human life but can cause economic loss, environment damage, disruption of lifeline facilities, or impact other concerns. Significant hazard potential classification dams are often located in predominantly rural or agricultural areas but could be in areas with population and significant infrastructure.

Low

Dams assigned the low hazard potential classification are those where failure or mis-operation results in no probable loss of human life and low economic and/or environmental losses. Losses are principally limited to the owner’s property.

Undetermined

Dams for which a downstream hazard potential has not been designated or is not provided.

Not Available

Dams for which the downstream hazard potential is restricted to approved government users.

Source: National Inventory of Dams

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