Amwell No. 3 Dam Reservoir Report

Last Updated: December 6, 2025

Amwell No.


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Summary

3 Dam, located in West Amwell Township, New Jersey, is a private earth dam completed in 1970 with a primary purpose of recreation. Standing at 26 feet tall and spanning 330 feet in length, this dam holds a storage capacity of 122 acre-feet and serves as a vital component in managing water resources in the area. The dam is situated on the Branch Alexauken Creek and is regulated by the New Jersey Department of Environmental Protection (NJDEP) to ensure proper inspection, permitting, and enforcement measures are in place.

With a significant hazard potential but a satisfactory condition assessment as of November 2020, Amwell No. 3 Dam plays a crucial role in flood control and water supply management in Hunterdon County, New Jersey. The dam's normal storage capacity of 62 acre-feet and a maximum discharge rate of 600 cubic feet per second highlight its importance in mitigating flooding risks and maintaining a stable water supply for the surrounding area. Regular inspections and emergency preparedness measures are in place to ensure the dam's safety and functionality.

As a key structure in the water resource management system, Amwell No. 3 Dam serves not only as a recreational spot but also as a critical component in safeguarding the community from potential hazards. With its strategic location and significant storage capacity, this dam exemplifies the importance of proper regulation, maintenance, and emergency preparedness in ensuring the resilience of water infrastructure in the face of changing climate conditions.

Year Completed

1970

Dam Length

330

Dam Height

26

River Or Stream

Branch Alexauken Creek

Primary Dam Type

Earth

Surface Area

10

Drainage Area

0.44

Nid Storage

122

Hazard Potential

Significant

Nid Height

26
       
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.