Chapman Dam
Chapman Dam is a concrete dam located in St. Lawrence County, New York, built in 1971. It carries a Low hazard potential classification.
About Chapman Dam
The primary purpose of Chapman Dam is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by Murray Simons (private). It impounds the Grass Creek near Nelson Corners.
The dam stands 16 feet tall and stretches 60 feet across, creates a reservoir covering 320 acres, has a maximum storage capacity of 1,800 acre-feet, and collects water from a drainage area of 6 square miles. Completed in 1971, the structure is well into its service life at over 50 years 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 10/25/2024.
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Location
| State | New York |
| County | St. Lawrence |
| Nearest City | Nelson Corners |
| River/Stream | Grass Creek |
| Coordinates | 44.36167, -75.69500 |
Physical Characteristics
| Dam Type | Concrete |
| NID Height | 16 ft |
| Dam Height | 16 ft |
| Dam Length | 60 ft |
| Year Completed | 1971 (55 years old) |
Storage & Hydraulics
| NID Storage | 1,800 acre-ft |
| Max Storage | 1,800 acre-ft |
| Normal Storage | 1,067 acre-ft |
| Surface Area | 320 acres |
| Drainage Area | 6 sq mi |
| Max Discharge | 560 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Recreation |
| Owner | Murray Simons |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Not Rated |
| Last Inspection | 10/25/2024 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | NY00387 |
| Federal ID | NY00387 |
| More Info | State Dam Safety Program |