Wilder Dam

Wilder Dam Quick Facts

Location: Grafton, New Hampshire
Coordinates: 43.6668, -72.3041
River: Connecticut River
Primary Purpose: Hydroelectric
Type: Concrete Earth Gravity
Commissioned: 1950
Dam Height: 59 ft (18 m)
Dam Length: 2,900 ft (884 m)
Dam Capacity: 55,000 acre-ft (67,841 Ml)
Condition Assessment: Satisfactory
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Wilder Dam Map

Wilder Dam Information

Wilder Dam is a concrete earth gravity dam located about 3 miles from West Lebanon, Grafton, New Hampshire.

The dam, which is on the Connecticut River, was primarily built for Hydroelectric purposes, but also serves for Recreation benefits.

The dam was designed by and commissioned in 1950 and is currently owned by Great River Hydro, LLC.

Wilder Dam Structure

The Wilder Dam is approximately 2,900 feet (884 m) long, 59 feet (18 m) high and has a structural volume of cubic yards (0 cubic metres).

Wilder Dam Storage Capacity & Surface Area

The reservoir has a normal storage capacity of 55,000 acre-ft (67,841 Ml) and maximum capacity of 55,000 acre-ft (67,841 Ml).

The surface area of the reservoir is 3,100 acres (1,255 ha) and the total catchment area is 3,375 square miles (8,741 square kilometres).

Wilder Dam Spillway

The dam has a 241 feet (73 m) wide controlled spillway with a maximum discharge capacity of 302000 cubic feet per second (8552 cubic metres per second).

Wilder Dam Compared to Five Famous American Dams

Height (ft)
Length (Ft)
Storage Volume (acre-ft)
Drainage Area (sq miles)
 
Wilder Dam
Grafton, New Hampshire
Height (ft)
59
Length (Ft)
2,900
Storage Volume (acre-ft)
55,000
Drainage Area (sq miles)
3,375
Hoover Dam
Clark County, Nevada
Height (ft)
730
Length (Ft)
1,244
Storage Volume (acre-ft)
30,237,000
Drainage Area (sq miles)
167,800
Grand Coulee Dam
Okanogan County, Washington
Height (ft)
550
Length (Ft)
5,673
Storage Volume (acre-ft)
9,562,0000
Drainage Area (sq miles)
74,100
Theodore Roosevelt Dam
Maricopa County, Arizona
Height (ft)
357
Length (Ft)
1,208
Storage Volume (acre-ft)
3,411,500
Drainage Area (sq miles)
5,736
Oroville Dam
Butte County, California
Height (ft)
235
Length (Ft)
6,920
Storage Volume (acre-ft)
3,540,000
Drainage Area (sq miles)
3,611
Glen Canyon Dam
Coconino County, Arizona
Height (ft)
216
Length (Ft)
1,565
Storage Volume (acre-ft)
29,875,000
Drainage Area (sq miles)
108,355

Wilder Dam Weather

Current Conditions at Wilder Dam

Failed to fetch current weather data.

7-Day Forecast for Wilder Dam

Failed to fetch weather forecast data.

Wilder Dam Frequently Asked Questions

In which state is the Wilder Dam?

Wilder Dam is in New Hampshire.

In which county is the Wilder Dam?

Wilder Dam is in Grafton County.

How high is the Wilder Dam?

Wilder Dam is 59 feet high.

How long is the Wilder Dam?

Wilder Dam is 2,900 feet long.

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More Dams in Grafton County:

Ayers Island Dam
Comerford Dam
Goose Pond Dam
Grafton Pond Dam
Mascoma Lake Dam
Moore Dam
Newfound Lake Dam
Squam Lake Dam
Wilder Dam

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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