Groos Pond Dam
Groos Pond Dam is a concrete dam located in Sullivan County, New York, built in 1940. It carries a Significant hazard potential classification and has a poor condition assessment.
About Groos Pond Dam
The primary purpose of Groos Pond 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 Forest Pond Resort;the Center For Discovery (private). It impounds the Tr-sheldrake Stream near South Fallsburg.
The dam stands 10 feet tall and stretches 95 feet across, creates a reservoir covering 24 acres, and has a maximum storage capacity of 80 acre-feet. Completed in 1940, 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. Its condition is rated poor, meaning the dam has recognized safety deficiencies that require remediation to address risks. The most recent inspection on record was 08/09/2023.
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Location
| State | New York |
| County | Sullivan |
| Nearest City | South Fallsburg |
| River/Stream | Tr-sheldrake Stream |
| Coordinates | 41.71750, -74.63806 |
Physical Characteristics
| Dam Type | Concrete |
| NID Height | 10 ft |
| Dam Height | 10 ft |
| Dam Length | 95 ft |
| Year Completed | 1940 (86 years old) |
Storage & Hydraulics
| NID Storage | 80 acre-ft |
| Max Storage | 80 acre-ft |
| Normal Storage | 72 acre-ft |
| Surface Area | 24 acres |
| Max Discharge | 60 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Flood Risk Reduction |
| Owner | Forest Pond Resort;The Center For Discovery |
| Owner Type | Private |
| Hazard Classification | Significant |
| Condition Assessment | Poor |
| Last Inspection | 08/09/2023 |
| Emergency Action Plan | No |
Identifiers
| NID ID | NY01287 |
| Federal ID | NY01287 |
| More Info | State Dam Safety Program |