Swimming River Reservoir Dam Reservoir Report

Last Updated: December 8, 2025

Located in Red Bank, New Jersey, the Swimming River Reservoir Dam stands as a vital structure for water supply purposes, serving as a primary source for the surrounding area.


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Summary

Built in 1901, this earth dam towers at a height of 45 feet and stretches out to a length of 2400 feet, with a storage capacity of 14,300 acre-feet. The dam overlooks the Robins Swamp Brook and is regulated by the New Jersey Department of Environmental Protection, ensuring its safety and functionality.

With a high hazard potential but a satisfactory condition assessment, the Swimming River Reservoir Dam is regularly inspected every two years to maintain its integrity. The dam's emergency action plan was last revised in 2014, highlighting the importance of preparedness in case of potential risks or emergencies. Its location in Colts Neck Township within Monmouth County underscores its significance as a key component of the region's water infrastructure, providing essential services to local communities and ensuring a stable water supply for the area.

As a crucial piece of New Jersey's water resource management infrastructure, the Swimming River Reservoir Dam plays a pivotal role in regulating water flow, storage, and distribution. Its historical significance, coupled with its modern-day functionality, showcases the intersection of past engineering achievements and contemporary water resource management practices. Enthusiasts interested in water resources and climate will find the dam's specifications, operational details, and regulatory oversight to be of particular interest, highlighting the complex interplay between human-made structures and natural water systems in addressing societal needs and environmental stewardship.

Year Completed

1901

Dam Length

2400

Dam Height

45

River Or Stream

Robins Swamp Brook

Primary Dam Type

Earth

Surface Area

557

Drainage Area

48.5

Nid Storage

14300

Hazard Potential

High

Nid Height

45
       
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.