Cumberland Pond Dam Reservoir Report

Last Updated: December 13, 2025

Cumberland Pond Dam, located in Maurice River Township, New Jersey, is a state-regulated structure that serves the primary purpose of recreation.


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Summary

Built in 1929, this earth dam stands at a height of 12 feet and spans 840 feet in length, with a storage capacity of 57 acre-feet and a surface area of 26 acres. The dam is situated on the Manumuskin River and is owned by the state, falling under the jurisdiction of the New Jersey Department of Environmental Protection (NJDEP).

Despite its recreational significance, Cumberland Pond Dam poses a significant hazard potential and has been assessed to be in poor condition as of April 2021. The dam is subject to periodic inspections, with the most recent one conducted in April 2021, and has an inspection frequency of every two years. In the event of an emergency, the dam lacks an Emergency Action Plan (EAP) and associated inundation maps, raising concerns about its readiness to manage potential risks and disasters.

As an essential infrastructure for water resource and climate enthusiasts, Cumberland Pond Dam's condition and regulatory oversight demand attention and potential improvements to ensure the safety of its surrounding community and recreational users. Efforts to enhance the dam's emergency preparedness, risk assessment, and overall maintenance may be crucial in safeguarding its long-term functionality and mitigating potential hazards.

Year Completed

1929

Dam Length

840

Dam Height

12

River Or Stream

Manumuskin River

Primary Dam Type

Earth

Surface Area

26

Drainage Area

27.9

Nid Storage

57

Hazard Potential

Significant

Nid Height

12
       
Seasonal Comparison

Weather Forecast

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Nearby Streamflow Levels

Cumberland Pond DamTUCKAHOE RIVER AT HEAD OF RIVER NJ Preview Tuckahoe River At Head Of River Nj
24.2cfs
24cfs
Cumberland Pond DamMAURICE RIVER AT NORMA NJ Preview Maurice River At Norma Nj
67.8cfs
68cfs
Cumberland Pond DamGREAT EGG HARBOR RIVER AT FOLSOM NJ Preview Great Egg Harbor River At Folsom Nj
38.5cfs
39cfs
Cumberland Pond DamCOHANSEY RIVER AT SEELEY NJ Preview Cohansey River At Seeley Nj
17.8cfs
18cfs
Cumberland Pond DamGREAT EGG HARBOR R NR BLUE ANCHOR NJ Preview Great Egg Harbor R Nr Blue Anchor Nj
24.1cfs
24cfs
Cumberland Pond DamLITTLE EASE RN NR CLAYTON NJ Preview Little Ease Rn Nr Clayton Nj
2.3cfs
2cfs

Dam Data Reference

Condition Assessment

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.
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Nearby Reservoirs