J. Seward Johnson Dam
J. Seward Johnson Dam is an earth dam located in Hunterdon County, New Jersey, built in 1967. It carries a Low hazard potential classification and has a poor condition assessment.
About J. Seward Johnson Dam
The primary purpose of J. Seward Johnson Dam is irrigation. The dam stores and diverts water for agricultural irrigation, supporting farming operations in the surrounding area. The dam is owned by James Loring Johnson (private). It impounds the Cold Brook near Oldwick.
The dam stands 24 feet tall and stretches 1,150 feet across, creates a reservoir covering 6 acres, has a storage capacity of 50 acre-feet, and collects water from a drainage area of 0 square miles. Completed in 1967, the structure is well into its service life at over 50 years old.
This dam has a low hazard potential classification, meaning that failure would cause minimal damage, limited primarily to the dam owner's property, with no expected 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 03/11/2021.
Search for dams near your address to see all dams in your area with hazard classifications and safety data.
Location
| State | New Jersey |
| County | Hunterdon |
| Nearest City | Oldwick |
| River/Stream | Cold Brook |
| Coordinates | 40.68798, -74.75342 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 24 ft |
| Dam Height | 24 ft |
| Dam Length | 1,150 ft |
| Year Completed | 1967 (59 years old) |
Storage & Hydraulics
| NID Storage | 50 acre-ft |
| Normal Storage | 50 acre-ft |
| Surface Area | 6 acres |
| Drainage Area | 0 sq mi |
| Max Discharge | 450 cfs |
Ownership & Safety
| Purpose | Irrigation |
| Owner | James Loring Johnson |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Poor |
| Last Inspection | 03/11/2021 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | NJ00770 |
| Federal ID | NJ00770 |
| More Info | State Dam Safety Program |