Grossingers Lake Dam
Grossingers Lake Dam is an earth dam located in Sullivan County, New York, built in 1950. It carries a Significant hazard potential classification.
About Grossingers Lake Dam
The primary purpose of Grossingers Lake Dam is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by Cappelli Organization (private). It impounds the Tr-east Mongaup River near Harris.
The dam stands 15 feet tall and stretches 200 feet across, creates a reservoir covering 26 acres, and has a maximum storage capacity of 245 acre-feet. Completed in 1950, the structure is well-established, with more than 75 years of service.
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. The most recent inspection on record was 08/09/2023.
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Location
| State | New York |
| County | Sullivan |
| Nearest City | Harris |
| River/Stream | Tr-east Mongaup River |
| Coordinates | 41.79083, -74.71889 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 15 ft |
| Dam Height | 15 ft |
| Dam Length | 200 ft |
| Year Completed | 1950 (76 years old) |
Storage & Hydraulics
| NID Storage | 245 acre-ft |
| Max Storage | 245 acre-ft |
| Normal Storage | 120 acre-ft |
| Surface Area | 26 acres |
| Max Discharge | 515 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Recreation |
| Owner | Cappelli Organization |
| Owner Type | Private |
| Hazard Classification | Significant |
| Condition Assessment | Not Rated |
| Last Inspection | 08/09/2023 |
| Emergency Action Plan | No |
Identifiers
| NID ID | NY01279 |
| Federal ID | NY01279 |
| More Info | State Dam Safety Program |