Twin Lake Dam, California, USA

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Quick Facts About Twin Lake Dam

Location: Alpine, California
Coordinates: 38.6089, -119.944518
River: North Fork Mokelumne River-Tr
Primary Purpose: Hydroelectric
Type: Earth
Commissioned: 1903
Dam Height: 22 ft (7 m)
Dam Length: 1,520 ft (463 m)
Dam Capacity: 21,581 acre-ft (26,620 Ml)
Condition Assessment: Not Available

Twin Lake Dam Map

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Twin Lake Dam Information

Twin Lake Dam is an earthen embankment dam located about 2 miles from Kirkwood, Alpine, California.

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

The dam was designed by and commissioned in 1903 and is currently owned by Pacific Gas and Electric Company.

Twin Lake Dam Structure

The Twin Lake Dam is approximately 1,520 feet (463 m) long, 22 feet (7 m) high and has a structural volume of cubic yards (0 cubic metres).

Twin Lake Dam Storage Capacity & Surface Area

The reservoir has a normal storage capacity of 1,210 acre-ft (1,493 Ml) and maximum capacity of 21,581 acre-ft (26,620 Ml).

The surface area of the reservoir is 600 acres (243 ha) and the total catchment area is 14 square miles (35 square kilometres).

Twin Lake Dam Spillway

The dam has a 295.5 feet (90 m) wide uncontrolled spillway with a maximum discharge capacity of 12400 cubic feet per second (351 cubic metres per second).

Twin Lake Dam Compared to Four Famous American Dams

Twin Lake Dam
Alpine, 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) 22 730 550 357 216
Length (Ft) 1,520 1,244 5,673 6,920 1,565
Storage Volume (acre-ft) 21,581 30,237,000 9,562,000 3,540,000 29,875,000
Drainage Area (sq miles) 14 167,800 74,100 3,611 108,355

Twin Lake Dam Weather

Current Conditions at Twin Lake Dam

Failed to fetch current weather data.

7-Day Forecast for Twin Lake Dam

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Twin Lake Dam Frequently Asked Questions

In which state is the Twin Lake Dam?

Twin Lake Dam is in California.

In which county is the Twin Lake Dam?

Twin Lake Dam is in Alpine County.

How high is the Twin Lake Dam?

Twin Lake Dam is 22 feet high.

How long is the Twin Lake Dam?

Twin Lake Dam is 1,520 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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