Blue Mt Lake Dam Reservoir Report

Last Updated: December 13, 2025

Blue Mt Lake Dam, located in Millbrook Village, New Jersey, is a federally owned structure managed by the National Park Service.


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Summary

Built in 1963 by the USDA NRCS, this earth dam stands at a height of 26 feet and spans 500 feet across Vancampens Brook. The primary purpose of Blue Mt Lake Dam is for recreation, including fish and wildlife pond activities.

With a normal storage capacity of 96 acre-feet and a maximum discharge rate of 4575 cubic feet per second, the dam poses a low hazard potential and is classified as having a moderate risk level. The spillway, measuring 185 feet wide, is uncontrolled and the dam features uncontrolled outlet gates. While the condition assessment is not available, the dam undergoes inspections every 5 years by the National Park Service.

Blue Mt Lake Dam plays a crucial role in providing recreational opportunities and maintaining the ecological balance of the surrounding area. Water resource and climate enthusiasts can appreciate the engineering behind this vital structure, which serves as a testament to responsible water management practices in New Jersey's Sussex County.

Year Completed

1963

Dam Length

500

Dam Height

26

River Or Stream

Vancampens Brook

Primary Dam Type

Earth

Surface Area

14

Hydraulic Height

26

Drainage Area

0.66

Nid Storage

171

Structural Height

26

Outlet Gates

Uncontrolled

Hazard Potential

Low

Foundations

Rock, Soil

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.