Glass Lake Dam Reservoir Report
Nearby: Kane Dam Faith Mills Lower Dam
Last Updated: December 19, 2025
Glass Lake Dam, located in Sand Lake, New York, is a private structure built in 1916 with a primary purpose of recreation.
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Summary
This masonry dam stands at a height of 18 feet and has a length of 50 feet, providing a storage capacity of 3630 acre-feet. The dam, situated on the WYNANTSKILL river, has a surface area of 108 acres and drains an area of 3.98 square miles.
Although the dam is classified as having a significant hazard potential, its condition was last assessed as fair in January 2020. Regular inspections are conducted every four years to ensure its safety. The spillway type is uncontrolled, with a width of 18 feet. While there are no associated locks or gates, the dam remains a popular spot for recreational activities. With its historical significance and moderate risk assessment, Glass Lake Dam continues to be a focal point for water resource and climate enthusiasts in the region.
Year Completed |
1916 |
Dam Length |
50 |
Dam Height |
18 |
River Or Stream |
WYNANTSKILL |
Primary Dam Type |
Masonry |
Surface Area |
108 |
Drainage Area |
3.98 |
Nid Storage |
3630 |
Hazard Potential |
Significant |
Nid Height |
18 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Valatie Kill Near Nassau Ny
|
23cfs |
Hudson River At Green Island Ny
|
6390cfs |
Normans Kill At Albany Ny
|
78cfs |
Mohawk River At Cohoes Ny
|
3550cfs |
Hudson River At Lock 1 Near Waterford Ny
|
4430cfs |
Hudson R Above Lock 1 Nr Waterford Ny
|
3930cfs |
Dam Data Reference
Condition Assessment
SatisfactoryNo 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
HighDams 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.
Glass Lake Dam