Lake Hopatcong Dam

Lake Hopatcong Dam Quick Facts

Location: Morris, New Jersey
Coordinates: 40.917667, -74.6641833
River: Musconetcong River
Primary Purpose: Flood Risk Reduction
Type: Concrete
Commissioned: 1925
Dam Height: 17 ft (5 m)
Dam Length: 271 ft (83 m)
Dam Capacity: acre-ft (0 Ml)
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Lake Hopatcong Dam Map

Lake Hopatcong Dam Information

Lake Hopatcong Dam is a concrete dam located in Morris County, New Jersey.

The dam, which is on the Musconetcong River, was primarily built for Flood Risk Reduction purposes, but also serves for benefits.

The dam was designed by and commissioned in 1925 and is currently owned by Division of Parks and Forestry.

Lake Hopatcong Dam Structure

The Lake Hopatcong Dam is approximately 271 feet (83 m) long, 17 feet (5 m) high and has a structural volume of cubic yards (0 cubic metres).

Lake Hopatcong Dam Storage Capacity & Surface Area

The reservoir has a normal storage capacity of 48,209 acre-ft (59,465 Ml) and maximum capacity of acre-ft (0 Ml).

The surface area of the reservoir is 2,474 acres (1,001 ha) and the total catchment area is 25 square miles (66 square kilometres).

Lake Hopatcong Dam Spillway

According to the latest available data, the Lake Hopatcong Dam does not have any spillways.

Lake Hopatcong Dam Compared to Five Famous American Dams

Height (ft)
Length (Ft)
Storage Volume (acre-ft)
Drainage Area (sq miles)
 
Lake Hopatcong Dam
Morris, New Jersey
Height (ft)
17
Length (Ft)
271
Storage Volume (acre-ft)
Drainage Area (sq miles)
25
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

Lake Hopatcong Dam Weather

Current Conditions at Lake Hopatcong Dam

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7-Day Forecast for Lake Hopatcong Dam

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Lake Hopatcong Dam Frequently Asked Questions

In which state is the Lake Hopatcong Dam?

Lake Hopatcong Dam is in New Jersey.

In which county is the Lake Hopatcong Dam?

Lake Hopatcong Dam is in Morris County.

How high is the Lake Hopatcong Dam?

Lake Hopatcong Dam is 17 feet high.

How long is the Lake Hopatcong Dam?

Lake Hopatcong Dam is 271 feet long.

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More Dams in Morris County:

Blanchard Dam
Boonton Dam
Charlotteburg Dam
Council Grove City Lake Dam
Council Grove Dam
Ellison Creek Dam
Lake Hopatcong Dam
Lake Kahola Dam
Parsippany Dike
Peacock Site 1a Tailings Reservoir Dm Dam
Sorrells Reservoir Dam
Split Rock Pond 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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