Hemlock Lake Dam
Hemlock Lake Dam is an earth dam located in Sussex County, New Jersey, built in 1951. 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 Christian Reinauer (private). It impounds the Pequest River-tr near Andover.
The dam stands 20 feet tall and stretches 250 feet across, creates a reservoir covering 10 acres, has a storage capacity of 22 acre-feet, and collects water from a drainage area of 0 square miles. Completed in 1951, the structure is well into its service life at over 50 years 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. An emergency action plan is in place for this dam. The most recent inspection on record was 12/06/2024.
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Location
| State | New Jersey |
| County | Sussex |
| Nearest City | Andover |
| River/Stream | Pequest River-tr |
| Coordinates | 40.97985, -74.73192 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 20 ft |
| Dam Height | 20 ft |
| Dam Length | 250 ft |
| Year Completed | 1951 (75 years old) |
Storage & Hydraulics
| NID Storage | 22 acre-ft |
| Normal Storage | 22 acre-ft |
| Surface Area | 10 acres |
| Drainage Area | 0 sq mi |
| Max Discharge | 487 cfs |
Ownership & Safety
| Purpose | Recreation |
| Owner | Christian Reinauer |
| Owner Type | Private |
| Hazard Classification | Significant |
| Condition Assessment | Poor |
| Last Inspection | 12/06/2024 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | NJ00148 |
| Federal ID | NJ00148 |
| More Info | State Dam Safety Program |