Shadow Lake Dam
Shadow Lake Dam is an earth dam located in Monmouth County, New Jersey, built in 1931. It carries a Significant hazard potential classification and has a poor condition assessment.
About Shadow Lake Dam
The primary purpose of Shadow Lake Dam is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by Monmouth County Engineering (local government). It impounds the Quioley Creek.
The dam stands 16 feet tall and stretches 600 feet across, creates a reservoir covering 83 acres, has a storage capacity of 310 acre-feet, and collects water from a drainage area of 7 square miles. Completed in 1931, 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 11/27/2024.
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Location
| State | New Jersey |
| County | Monmouth |
| River/Stream | Quioley Creek |
| Coordinates | 40.35280, -74.08502 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 16 ft |
| Dam Height | 16 ft |
| Dam Length | 600 ft |
| Year Completed | 1931 (95 years old) |
Storage & Hydraulics
| NID Storage | 310 acre-ft |
| Normal Storage | 310 acre-ft |
| Surface Area | 83 acres |
| Drainage Area | 7 sq mi |
| Max Discharge | 1,916 cfs |
Ownership & Safety
| Purpose | Recreation |
| Owner | Monmouth County Engineering |
| Owner Type | Local Government |
| Hazard Classification | Significant |
| Condition Assessment | Poor |
| Last Inspection | 11/27/2024 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | NJ00090 |
| Federal ID | NJ00090 |
| More Info | State Dam Safety Program |