St. Mary's Abbey Lower Dam
St. Mary's Abbey Lower Dam is an earth dam located in Morris County, New Jersey. It carries a Significant hazard potential classification and has a poor condition assessment.
About St. Mary's Abbey Lower Dam
The primary purpose of St. Mary's Abbey Lower Dam is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by S. Mary's Abbey;the Order Of St. Benedict Of Nj (private). It impounds the Whippany River-tr near Morristown.
The dam stands 13 feet tall and stretches 100 feet across, creates a reservoir covering 4 acres, has a maximum storage capacity of 15 acre-feet, and collects water from a drainage area of 0 square miles.
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 05/22/2023.
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Location
| State | New Jersey |
| County | Morris |
| Nearest City | Morristown |
| River/Stream | Whippany River-tr |
| Coordinates | 40.78882, -74.52418 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 13 ft |
| Dam Height | 13 ft |
| Dam Length | 100 ft |
Storage & Hydraulics
| NID Storage | 15 acre-ft |
| Max Storage | 15 acre-ft |
| Normal Storage | 8 acre-ft |
| Surface Area | 4 acres |
| Drainage Area | 0 sq mi |
| Max Discharge | 845 cfs |
Ownership & Safety
| Purpose | Recreation |
| Owner | S. Mary's Abbey;The Order of St. Benedict of NJ |
| Owner Type | Private |
| Hazard Classification | Significant |
| Condition Assessment | Poor |
| Last Inspection | 05/22/2023 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | NJ00924 |
| Federal ID | NJ00924 |
| More Info | State Dam Safety Program |