Hemlock Lake Dam
Hemlock Lake Dam is an earth dam located in Sullivan County, New York, built in 1890. It carries a Significant hazard potential classification and has a poor condition assessment.
About Hemlock Lake Dam
The primary purpose of Hemlock Lake Dam is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by Hartwood Club (private). It impounds the Bush Kill near Hartwood Club.
The dam stands 27 feet tall and stretches 200 feet across, creates a reservoir covering 38 acres, and has a maximum storage capacity of 536 acre-feet. Completed in 1890, 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 poor, meaning the dam has recognized safety deficiencies that require remediation to address risks. The most recent inspection on record was 05/05/2021.
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Location
| State | New York |
| County | Sullivan |
| Nearest City | Hartwood Club |
| River/Stream | Bush Kill |
| Coordinates | 41.50444, -74.72000 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 27 ft |
| Dam Height | 27 ft |
| Dam Length | 200 ft |
| Year Completed | 1890 (136 years old) |
Storage & Hydraulics
| NID Storage | 536 acre-ft |
| Max Storage | 536 acre-ft |
| Normal Storage | 460 acre-ft |
| Surface Area | 38 acres |
| Spillway Type | Controlled |
Ownership & Safety
| Purpose | Recreation |
| Owner | HARTWOOD CLUB |
| Owner Type | Private |
| Hazard Classification | Significant |
| Condition Assessment | Poor |
| Last Inspection | 05/05/2021 |
| Emergency Action Plan | No |
Identifiers
| NID ID | NY00319 |
| Federal ID | NY00319 |
| More Info | State Dam Safety Program |