Cascade Dam, Idaho, USA

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Quick Facts About Cascade Dam

Location: Valley, Idaho
Coordinates: 44.5253, -116.0508
River: North Fork Payette River Payette River
Primary Purpose: Hydroelectric
Type: Rockfill Earth
Commissioned: 1948
Dam Height: 110 ft (34 m)
Dam Length: 785 ft (239 m)
Dam Capacity: 860,000 acre-ft (1,060,793 Ml)
Condition Assessment: Not Available

Cascade Dam Map

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Cascade Dam Information

Cascade Dam is a rockfill earth dam located about 1 miles from Cascade, Valley, Idaho.

The dam, which is on the North Fork Payette River Payette River, was primarily built for Hydroelectric purposes, but also serves for Irrigation benefits.

The dam was designed by US Bureau of Reclamation and commissioned in 1948 and is currently owned by US Bureau of Reclamation.

Cascade Dam Structure

The Cascade Dam is approximately 785 feet (239 m) long, 110 feet (34 m) high and has a structural volume of 395,000 cubic yards (301,999 cubic metres).

Cascade Dam Storage Capacity & Surface Area

The reservoir has a normal storage capacity of 703,000 acre-ft (867,136 Ml) and maximum capacity of 860,000 acre-ft (1,060,793 Ml).

The surface area of the reservoir is 27,700 acres (11,210 ha) and the total catchment area is 2,230 square miles (5,776 square kilometres).

Cascade Dam Spillway

The dam has a 42 feet (13 m) wide controlled spillway with a maximum discharge capacity of 12500 cubic feet per second (354 cubic metres per second).

Cascade Dam Compared to Four Famous American Dams

Cascade Dam
Valley, 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) 110 730 550 357 216
Length (Ft) 785 1,244 5,673 6,920 1,565
Storage Volume (acre-ft) 860,000 30,237,000 9,562,000 3,540,000 29,875,000
Drainage Area (sq miles) 2,230 167,800 74,100 3,611 108,355

Cascade Dam Weather

Current Conditions at Cascade Dam

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7-Day Forecast for Cascade Dam

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Cascade Dam Frequently Asked Questions

In which state is the Cascade Dam?

Cascade Dam is in Idaho.

In which county is the Cascade Dam?

Cascade Dam is in Valley County.

How high is the Cascade Dam?

Cascade Dam is 110 feet high.

How long is the Cascade Dam?

Cascade Dam is 785 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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