Stewart Mountain Dam, Arizona, USA

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Quick Facts About Stewart Mountain Dam

Location: Maricopa, Arizona
Coordinates: 33.5665, -111.5359
River: Salt River
Primary Purpose: Hydroelectric
Type: Concrete Arch
Commissioned: 1929
Dam Height: 207 ft (63 m)
Dam Length: 1,260 ft (384 m)
Dam Capacity: 70,070 acre-ft (86,430 Ml)
Condition Assessment: Not Available

Stewart Mountain Dam Map

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Stewart Mountain Dam Information

Stewart Mountain Dam is a concrete arch dam located about 27 miles from Mesa, Maricopa, 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 1929 and is currently owned by US Bureau of Reclamation.

Stewart Mountain Dam Structure

The Stewart Mountain Dam is approximately 1,260 feet (384 m) long, 207 feet (63 m) high and has a structural volume of 120,500 cubic yards (92,129 cubic metres).

Stewart Mountain Dam Storage Capacity & Surface Area

The reservoir has a normal storage capacity of 69,765 acre-ft (86,054 Ml) and maximum capacity of 70,070 acre-ft (86,430 Ml).

The surface area of the reservoir is 1,265 acres (512 ha) and the total catchment area is 121 square miles (313 square kilometres).

Stewart Mountain Dam Spillway

The dam has a 267 feet (81 m) wide controlled spillway with a maximum discharge capacity of 105000 cubic feet per second (2973 cubic metres per second).

Stewart Mountain Dam Compared to Four Famous American Dams

Stewart Mountain 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) 207 730 550 357 216
Length (Ft) 1,260 1,244 5,673 6,920 1,565
Storage Volume (acre-ft) 70,070 30,237,000 9,562,000 3,540,000 29,875,000
Drainage Area (sq miles) 121 167,800 74,100 3,611 108,355

Stewart Mountain Dam Weather

Current Conditions at Stewart Mountain Dam

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7-Day Forecast for Stewart Mountain Dam

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Stewart Mountain Dam Frequently Asked Questions

In which state is the Stewart Mountain Dam?

Stewart Mountain Dam is in Arizona.

In which county is the Stewart Mountain Dam?

Stewart Mountain Dam is in Maricopa County.

How high is the Stewart Mountain Dam?

Stewart Mountain Dam is 207 feet high.

How long is the Stewart Mountain Dam?

Stewart Mountain Dam is 1,260 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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