Lower Wee-Wah Lake Dam Reservoir Report

Last Updated: December 6, 2025

Lower Wee-Wah Lake Dam, located in Tuxedo Park, New York, is a vital structure managed by the local government for recreational and water supply purposes.


°F

°F

mph

Wind

%

Humidity

Summary

Built in 1890, this earth dam stands at a height of 30 feet and spans 320 feet in length, providing storage capacity for up to 610 acre-feet of water. The dam is situated on the TR-Ramapo River and is regulated by the New York State Department of Environmental Conservation.

With a controlled spillway width of 40 feet and a surface area of 58 acres, Lower Wee-Wah Lake Dam poses a high hazard potential but is currently assessed to be in satisfactory condition. Regular inspections are conducted to ensure the safety and functionality of the dam, with the last assessment carried out in May 2019. Despite its age, the dam continues to meet guidelines and remains an essential component of the region's water resource infrastructure.

The surrounding area benefits from the recreational opportunities provided by Lower Wee-Wah Lake Dam, offering a picturesque setting for outdoor activities. However, the dam's very high risk assessment ranking highlights the importance of ongoing risk management measures to protect the community and the environment. As a historical landmark with significant water storage capacity, Lower Wee-Wah Lake Dam serves as a reminder of the delicate balance between human development and the preservation of natural resources in the face of climate challenges.

Year Completed

1890

Dam Length

320

Dam Height

30

River Or Stream

TR-RAMAPO RIVER

Primary Dam Type

Earth

Surface Area

58

Nid Storage

610

Hazard Potential

High

Nid Height

30
       
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.