Pyramid Dam, California, USA

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Quick Facts About Pyramid Dam

Location: Los Angeles, California
Coordinates: 34.6443, -118.7645
River: Piru Creek River
Primary Purpose: Water Supply
Type: Earth Rockfill
Commissioned: 1974
Dam Height: 400 ft (122 m)
Dam Length: 1,090 ft (332 m)
Dam Capacity: 171,000 acre-ft (210,925 Ml)
Condition Assessment: Not Available

Pyramid Dam Map

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Pyramid Dam Information

Pyramid Dam is an earth rockfill dam located about 12 miles from Piru, Los Angeles, California.

The dam, which is on the Piru Creek River, was primarily built for Water Supply purposes, but also serves for Recreation, Hydroelectric and Flood Risk Reduction benefits.

The dam was designed by DWR and commissioned in 1974 and is currently owned by California Department of Water Resources.

Pyramid Dam Structure

The Pyramid Dam is approximately 1,090 feet (332 m) long, 400 feet (122 m) high and has a structural volume of 6,860,000 cubic yards (5,244,847 cubic metres).

Pyramid Dam Storage Capacity & Surface Area

The reservoir has a normal storage capacity of 170,000 acre-ft (209,692 Ml) and maximum capacity of 171,000 acre-ft (210,925 Ml).

The surface area of the reservoir is 1,290 acres (522 ha) and the total catchment area is 432 square miles (1,119 square kilometres).

Pyramid Dam Spillway

The dam has a 40 feet (12 m) wide controlled spillway with a maximum discharge capacity of 20000 cubic feet per second (566 cubic metres per second).

Pyramid Dam Compared to Four Famous American Dams

Pyramid Dam
Los Angeles, California
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) 400 730 550 357 216
Length (Ft) 1,090 1,244 5,673 6,920 1,565
Storage Volume (acre-ft) 171,000 30,237,000 9,562,000 3,540,000 29,875,000
Drainage Area (sq miles) 432 167,800 74,100 3,611 108,355

Pyramid Dam Weather

Current Conditions at Pyramid Dam

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7-Day Forecast for Pyramid Dam

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Pyramid Dam Frequently Asked Questions

In which state is the Pyramid Dam?

Pyramid Dam is in California.

In which county is the Pyramid Dam?

Pyramid Dam is in Los Angeles County.

How high is the Pyramid Dam?

Pyramid Dam is 400 feet high.

How long is the Pyramid Dam?

Pyramid Dam is 1,090 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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