Hidden Valley Lake Dam
Hidden Valley Lake Dam is an earth dam located in Sussex County, New Jersey, built in 1967. It carries a Significant hazard potential classification and has a satisfactory condition assessment.
About Hidden Valley Lake Dam
The primary purpose of Hidden Valley Lake Dam is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by Hidden Valley Lake Association (private). It impounds the Pequest River-tr near Andover.
The dam stands 25 feet tall and stretches 350 feet across, creates a reservoir covering 44 acres, has a maximum storage capacity of 645 acre-feet, and collects water from a drainage area of 1 square miles. Completed in 1967, 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 satisfactory, indicating no existing or potential dam safety deficiencies are recognized. An emergency action plan is in place for this dam. The most recent inspection on record was 08/15/2024.
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Location
| State | New Jersey |
| County | Sussex |
| Nearest City | Andover |
| River/Stream | Pequest River-tr |
| Coordinates | 41.01622, -74.71492 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 25 ft |
| Dam Height | 25 ft |
| Dam Length | 350 ft |
| Year Completed | 1967 (59 years old) |
Storage & Hydraulics
| NID Storage | 645 acre-ft |
| Max Storage | 645 acre-ft |
| Normal Storage | 290 acre-ft |
| Surface Area | 44 acres |
| Drainage Area | 1 sq mi |
| Max Discharge | 913 cfs |
Ownership & Safety
| Purpose | Recreation |
| Owner | Hidden Valley Lake Association |
| Owner Type | Private |
| Hazard Classification | Significant |
| Condition Assessment | Satisfactory |
| Last Inspection | 08/15/2024 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | NJ00031 |
| Federal ID | NJ00031 |
| More Info | State Dam Safety Program |