Swan Lake Dam
Swan Lake Dam is a stone dam located in Sullivan County, New York, built in 1894. It carries a Significant hazard potential classification and has a fair condition assessment.
About Swan Lake Dam
The primary purpose of Swan Lake Dam is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by Swan Lake Commons Llc (private). It impounds the West Branch Mongaup River near Stevensville.
The dam stands 31 feet tall and stretches 135 feet across, creates a reservoir covering 327 acres, has a maximum storage capacity of 3,760 acre-feet, and collects water from a drainage area of 14 square miles. Completed in 1894, the structure is over a century old.
This dam has a significant hazard potential classification, meaning that a failure could cause significant economic damage — flooding roads, bridges, or property downstream — but is not expected to result in loss of life. Its condition is rated fair — the dam has minor deficiencies that are being addressed or do not pose an immediate safety threat. An emergency action plan is in place for this dam. The most recent inspection on record was 10/25/2022.
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Location
| State | New York |
| County | Sullivan |
| Nearest City | Stevensville |
| River/Stream | West Branch Mongaup River |
| Coordinates | 41.75306, -74.78250 |
Physical Characteristics
| Dam Type | Stone |
| NID Height | 31 ft |
| Dam Height | 31 ft |
| Dam Length | 135 ft |
| Year Completed | 1894 (132 years old) |
Storage & Hydraulics
| NID Storage | 3,760 acre-ft |
| Max Storage | 3,760 acre-ft |
| Normal Storage | 2,170 acre-ft |
| Surface Area | 327 acres |
| Drainage Area | 14 sq mi |
| Max Discharge | 950 cfs |
| Spillway Type | Controlled |
Ownership & Safety
| Purpose | Recreation |
| Owner | SWAN LAKE COMMONS LLC |
| Owner Type | Private |
| Hazard Classification | Significant |
| Condition Assessment | Fair |
| Last Inspection | 10/25/2022 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | NY00333 |
| Federal ID | NY00333 |
| More Info | State Dam Safety Program |