Horse Mesa Dam, Arizona, USA

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Quick Facts About Horse Mesa Dam

Location: Maricopa, Arizona
Coordinates: 33.5906, -111.3439
River: Salt River
Primary Purpose: Hydroelectric
Type: Concrete Arch
Commissioned: 1926
Dam Height: 305 ft (93 m)
Dam Length: 660 ft (201 m)
Dam Capacity: 261,335 acre-ft (322,351 Ml)
Condition Assessment: Not Available

Horse Mesa Dam Map

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Horse Mesa Dam Information

Horse Mesa Dam is a concrete arch dam located in Maricopa County, Arizona.

The dam, which is on the Salt River, was primarily built for Hydroelectric purposes, but also serves for Irrigation and Water Supply benefits.

The dam was designed by and commissioned in 1926 and is currently owned by US Bureau of Reclamation.

Horse Mesa Dam Structure

The Horse Mesa Dam is approximately 660 feet (201 m) long, 305 feet (93 m) high and has a structural volume of 162,000 cubic yards (123,858 cubic metres).

Horse Mesa Dam Storage Capacity & Surface Area

The reservoir has a normal storage capacity of 245,048 acre-ft (302,262 Ml) and maximum capacity of 261,335 acre-ft (322,351 Ml).

The surface area of the reservoir is 2,660 acres (1,076 ha) and the total catchment area is 210 square miles (544 square kilometres).

Horse Mesa Dam Spillway

According to the latest available data, the Horse Mesa Dam does not have any spillways.

Horse Mesa Dam Compared to Four Famous American Dams

Horse Mesa Dam
Maricopa, Arizona
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) 305 730 550 357 216
Length (Ft) 660 1,244 5,673 6,920 1,565
Storage Volume (acre-ft) 261,335 30,237,000 9,562,000 3,540,000 29,875,000
Drainage Area (sq miles) 210 167,800 74,100 3,611 108,355

Horse Mesa Dam Weather

Current Conditions at Horse Mesa Dam

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7-Day Forecast for Horse Mesa Dam

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Horse Mesa Dam Frequently Asked Questions

In which state is the Horse Mesa Dam?

Horse Mesa Dam is in Arizona.

In which county is the Horse Mesa Dam?

Horse Mesa Dam is in Maricopa County.

How high is the Horse Mesa Dam?

Horse Mesa Dam is 305 feet high.

How long is the Horse Mesa Dam?

Horse Mesa Dam is 660 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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