Grasse River Dam
Grasse River Dam is a timber crib dam located in St. Lawrence County, New York, built in 1881. It carries a Low hazard potential classification.
About Grasse River Dam
The primary purpose of Grasse River Dam is flood risk reduction. The dam is designed to control downstream flooding by temporarily storing excess water during storms and releasing it at a controlled rate. The dam is owned by New York State (state). It impounds the Grasse River.
The dam stands 13 feet tall and stretches 135 feet across, creates a reservoir covering 47 acres, has a maximum storage capacity of 4,500 acre-feet, and collects water from a drainage area of 44 square miles. Completed in 1881, the structure is over a century old.
This dam has a low hazard potential classification, meaning that failure would cause minimal damage, limited primarily to the dam owner's property, with no expected loss of life. The most recent inspection on record was 09/17/2014. That was over 11 years ago.
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Location
| State | New York |
| County | St. Lawrence |
| Nearest City | None |
| River/Stream | Grasse River |
| Coordinates | 44.25500, -74.74444 |
Physical Characteristics
| Dam Type | Timber Crib |
| NID Height | 13 ft |
| Dam Height | 13 ft |
| Dam Length | 135 ft |
| Year Completed | 1881 (145 years old) |
Storage & Hydraulics
| NID Storage | 4,500 acre-ft |
| Max Storage | 4,500 acre-ft |
| Normal Storage | 95 acre-ft |
| Surface Area | 47 acres |
| Drainage Area | 44 sq mi |
| Max Discharge | 2,000 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Flood Risk Reduction |
| Owner | NEW YORK STATE |
| Owner Type | State |
| Hazard Classification | Low |
| Condition Assessment | Not Rated |
| Last Inspection | 09/17/2014 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | NY12651 |
| Federal ID | NY12651 |
| More Info | State Dam Safety Program |