Suez Water Lambertville #2 Dam Reservoir Report

Last Updated: December 6, 2025

Suez Water Lambertville #2 Dam, located in Lambertville, New Jersey, serves as a vital water supply infrastructure on Swan Creek.


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Summary

Constructed in 1877, this privately owned Earth dam stands at a height of 16.5 feet and has a storage capacity of 168 acre-feet, with a normal storage level of 98 acre-feet. The dam spans 770 feet in length and covers a surface area of 18 acres, with a drainage area of 1.4 square miles.

Managed by the New Jersey Department of Environmental Protection, this dam is regulated, permitted, inspected, and enforced by state authorities to ensure its safety and functionality. With a high hazard potential but a satisfactory condition assessment as of November 2021, the dam undergoes inspections every two years to maintain its structural integrity. Although no spillway type is specified, the dam's maximum discharge capability is reported at 201 cubic feet per second, highlighting its crucial role in managing water flow in the region.

As a significant component of the local water supply infrastructure, Suez Water Lambertville #2 Dam plays a key role in providing essential water resources to the community. With its historical significance dating back over a century and ongoing regulatory oversight to ensure safety and compliance, this dam stands as a testament to the enduring importance of water management and climate resilience in the face of evolving environmental challenges.

Year Completed

1877

Dam Length

770

Dam Height

16.5

River Or Stream

Swan Creek

Primary Dam Type

Earth

Surface Area

18

Drainage Area

1.4

Nid Storage

168

Hazard Potential

High

Nid Height

17
       
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.