Old Mill Pond Dam Reservoir Report

Last Updated: December 8, 2025

Old Mill Pond Dam in Spring Lake, New Jersey, is a picturesque earth dam completed in 1948 for recreational purposes.


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Summary

Located on Wreck Pond Brook in Monmouth County, this dam stands at a height of 15 feet and spans 850 feet in length, creating a storage capacity of 68 acre-feet. With a surface area of 11 acres and a drainage area of 7.3 square miles, the dam serves as a vital recreational resource for the local community.

Managed by the local government and regulated by the New Jersey Department of Environmental Protection, Old Mill Pond Dam has a significant hazard potential but is currently assessed to be in satisfactory condition. The dam undergoes inspections every two years, with the last assessment conducted in March 2021. While no emergency action plan is currently in place, the dam meets regulatory guidelines and is equipped to handle potential risks associated with its operation.

In the event of an emergency, the responsible authorities are prepared to take necessary measures to ensure public safety. As a key feature in the local landscape, Old Mill Pond Dam provides not only recreational opportunities but also serves as a reminder of the importance of proper dam management in safeguarding water resources and mitigating climate-related risks in the community.

Year Completed

1948

Dam Length

850

Dam Height

15

River Or Stream

Wreck Pond Brook

Primary Dam Type

Earth

Surface Area

11

Drainage Area

7.3

Nid Storage

68

Hazard Potential

Significant

Nid Height

15
       
Seasonal Comparison

Weather Forecast

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.