Johnson Pond Dam is an earth dam located in Cape May County, New Jersey, built in 1759. It carries a Significant hazard potential classification and has a poor condition assessment.
Dam profile
NID height · 10 ft10 ft tall and 575 ft long. Height is drawn to scale against a two-story house, about 25 ft; the profile is a generic embankment section and the water level is illustrative.
About Johnson Pond Dam
The primary purpose of Johnson Pond Dam is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by Njdot (state). It impounds the Dennis Creek-tr near South Dennis.
The dam stands 10 feet tall and stretches 575 feet across, creates a reservoir covering 50 acres, has a storage capacity of 173 acre-feet, and collects water from a drainage area of 5 square miles. Completed in 1759, the structure is one of the older dams in the region, with over a century and a half 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 07/13/2023.
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Location
| State | New Jersey |
| County | Cape May |
| Nearest City | South Dennis |
| River/Stream | Dennis Creek-tr |
| Coordinates | 39.19258, -74.82500 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 10 ft |
| Dam Height | 10 ft |
| Dam Length | 575 ft |
| Year Completed | 1759 (267 years old) |
Storage & Hydraulics
| NID Storage | 173 acre-ft |
| Normal Storage | 173 acre-ft |
| Surface Area | 50 acres |
| Drainage Area | 5 sq mi |
| Max Discharge | 343 cfs |
Ownership & Safety
| Purpose | Recreation |
| Owner | Njdot |
| Owner Type | State |
| Hazard Classification | Significant |
| Condition Assessment | Poor |
| Last Inspection | 07/13/2023 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | NJ00128 |
| Federal ID | NJ00128 |
| More Info | State Dam Safety Program |