Sand Lake Dam Reservoir Report
Last Updated: December 13, 2025
Sand Lake Dam, located in Woodhull, New York, is a state-owned structure built in 1901 primarily for navigation purposes on the Grindstone Creek.
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Summary
This masonry dam stands at a height of 30 feet and has a length of 317 feet, with a storage capacity of 3,770 acre-feet. The dam's spillway is controlled and has a width of 65 feet, allowing for a maximum discharge of 400 cubic feet per second.
Despite its age, Sand Lake Dam has a low hazard potential and has not been rated for its condition as of the last inspection in September 1971. The risk assessment for the dam indicates a very high risk level, emphasizing the need for regular monitoring and maintenance to ensure its continued safety and functionality. With the New York State Department of Environmental Conservation overseeing regulation, inspection, and enforcement, Sand Lake Dam remains a crucial infrastructure for both navigation and recreation in the area, highlighting the importance of water resource management in the face of climate change challenges.
Year Completed |
1901 |
Dam Length |
317 |
Dam Height |
30 |
River Or Stream |
GRINDSTONE CREEK |
Primary Dam Type |
Masonry |
Surface Area |
313 |
Nid Storage |
3770 |
Hazard Potential |
Low |
Nid Height |
30 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
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.
Sand Lake Dam
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