Clyde Potts Reservoir Dam Reservoir Report

Last Updated: December 7, 2025

Clyde Potts Reservoir Dam, located in Mendham Township, New Jersey, stands tall at 80 feet high and spans 1460 feet in length.


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Summary

Completed in 1932, this Earth-type dam serves a primary purpose of water supply, with a storage capacity of 1500 acre-feet and a surface area of 46 acres. The dam is regulated by the New Jersey Department of Environmental Protection, ensuring its compliance with state permitting, inspection, and enforcement requirements.

The reservoir, situated on Harmony Brook, plays a crucial role in maintaining water resources for the local community in Morris County. With a maximum discharge capability of 6700 cubic feet per second, the dam provides flood control measures while also supporting irrigation and municipal water supply needs. Despite being classified as having a high hazard potential, the dam's condition is currently assessed as fair, with regular inspections conducted to monitor its structural integrity.

Managed by the local government, Clyde Potts Reservoir Dam serves as a vital infrastructure piece in safeguarding water resources and addressing climate-related challenges in the region. As water resource and climate enthusiasts, monitoring and supporting the maintenance and upkeep of such critical infrastructure are essential in ensuring the sustainability and resilience of water systems in the face of changing environmental conditions.

Year Completed

1932

Dam Length

1460

Dam Height

80

River Or Stream

Harmony Brook

Primary Dam Type

Earth

Surface Area

46

Drainage Area

1.9

Nid Storage

1500

Hazard Potential

High

Nid Height

80
       
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.