Greenwood Lk At Awosting Nj Reservoir Report

Last Updated: December 6, 2025

Greenwood Lake at Awosting in New Jersey is a popular recreational destination for boating, fishing, and swimming.


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Summary

The lake is situated in the Ramapo Mountains and spans across both New Jersey and New York. Greenwood Lake was originally built in the 1830s as part of a canal system to transport goods between New York City and the Delaware River. Today, the lake is primarily fed by the Wanaque and Ringwood rivers and its hydrology is largely affected by precipitation, snowpack, and surface runoff. The lake serves as a major source of drinking water for several communities in northern New Jersey. While there are no significant agricultural uses, the lake is a popular spot for recreational fishing and boating.

Reservoir Details

Lake Or Reservoir Water Surface Elevation Above Navd 1988, Ft 24hr Change 0.0%
Percent of Normal None%
Minimum 613.41 ft
2021-12-05
Maximum 697.07 ft
2025-06-18
Average 618 ft
Dam_Height 17
Drainage_Area 27.1
Year_Completed 1928
Nid_Storage 13269
Primary_Dam_Type Concrete
Surface_Area 1733
Hazard_Potential High
River_Or_Stream Wanaque River
Dam_Length 270
Nid_Height 17
       
Seasonal Comparison
Gage Height, Ft Levels
Lake Or Reservoir Water Surface Elevation Above Navd 1988, Ft Levels

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.