Flagstaff Dam, Maine, USA

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Quick Facts About Flagstaff Dam

Location: Somerset, Maine
Coordinates: 45.2232, -70.2014
River: Dead River
Primary Purpose: Hydroelectric
Type: Earth Concrete Gravity
Commissioned: 1948
Dam Height: 45 ft (14 m)
Dam Length: 1,339 ft (408 m)
Dam Capacity: 275,482 acre-ft (339,802 Ml)
Condition Assessment: Satisfactory

Flagstaff Dam Map

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Flagstaff Dam Information

Flagstaff Dam is an earth concrete gravity dam located about 17 miles from The Forks, Somerset, Maine.

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

The dam was designed by and commissioned in 1948 and is currently owned by Brookfield Renewable Power LLC NYRO.

Flagstaff Dam Structure

The Flagstaff Dam is approximately 1,339 feet (408 m) long, 45 feet (14 m) high and has a structural volume of cubic yards (0 cubic metres).

Flagstaff Dam Storage Capacity & Surface Area

The reservoir has a normal storage capacity of 275,482 acre-ft (339,802 Ml) and maximum capacity of 275,482 acre-ft (339,802 Ml).

The surface area of the reservoir is 17,950 acres (7,264 ha) and the total catchment area is 516 square miles (1,336 square kilometres).

Flagstaff Dam Spillway

The dam has a 625 feet (191 m) wide controlled spillway with a maximum discharge capacity of 20000 cubic feet per second (566 cubic metres per second).

Flagstaff Dam Compared to Four Famous American Dams

Flagstaff Dam
Somerset, Maine
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) 45 730 550 357 216
Length (Ft) 1,339 1,244 5,673 6,920 1,565
Storage Volume (acre-ft) 275,482 30,237,000 9,562,000 3,540,000 29,875,000
Drainage Area (sq miles) 516 167,800 74,100 3,611 108,355

Flagstaff Dam Weather

Current Conditions at Flagstaff Dam

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7-Day Forecast for Flagstaff Dam

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Flagstaff Dam Frequently Asked Questions

In which state is the Flagstaff Dam?

Flagstaff Dam is in Maine.

In which county is the Flagstaff Dam?

Flagstaff Dam is in Somerset County.

How high is the Flagstaff Dam?

Flagstaff Dam is 45 feet high.

How long is the Flagstaff Dam?

Flagstaff Dam is 1,339 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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