Tanzman Lake Dam
Tanzman Lake Dam is an earth dam located in Sullivan County, New York, built in 1950. It carries a Significant hazard potential classification and has a poor condition assessment.
About Tanzman Lake Dam
The primary purpose of Tanzman Lake Dam is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by The Legends Of Tanzman Lake Home Owners Association (private). It impounds the Tr-little Beaver Kill near Parksville.
The dam stands 17 feet tall and stretches 440 feet across, creates a reservoir covering 20 acres, has a maximum storage capacity of 167 acre-feet, and collects water from a drainage area of 2 square miles. 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. Its condition is rated poor, meaning the dam has recognized safety deficiencies that require remediation to address risks. An emergency action plan is in place for this dam. The most recent inspection on record was 09/17/2024.
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Location
| State | New York |
| County | Sullivan |
| Nearest City | Parksville |
| River/Stream | Tr-little Beaver Kill |
| Coordinates | 41.85028, -74.73917 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 17 ft |
| Dam Height | 17 ft |
| Dam Length | 440 ft |
| Year Completed | 1950 (76 years old) |
Storage & Hydraulics
| NID Storage | 167 acre-ft |
| Max Storage | 167 acre-ft |
| Normal Storage | 77 acre-ft |
| Surface Area | 20 acres |
| Drainage Area | 2 sq mi |
| Max Discharge | 1,000 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Recreation |
| Owner | THE LEGENDS OF TANZMAN LAKE HOME OWNERS ASSOCIATION |
| Owner Type | Private |
| Hazard Classification | Significant |
| Condition Assessment | Poor |
| Last Inspection | 09/17/2024 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | NY01280 |
| Federal ID | NY01280 |
| More Info | State Dam Safety Program |