Upper Garden Reservoir Dam
Upper Garden Reservoir Dam is an earth dam located in Morris County, New Jersey. It carries a Significant hazard potential classification and has a satisfactory condition assessment.
About Upper Garden Reservoir Dam
The primary purpose of Upper Garden Reservoir Dam is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by Greystone Park Psychiatric Hospital (state). It impounds the Whippany River-tr near Denvile.
The dam stands 6 feet tall and stretches 550 feet across, creates a reservoir covering 3 acres, 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 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 06/28/2023.
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Location
| State | New Jersey |
| County | Morris |
| Nearest City | Denvile |
| River/Stream | Whippany River-tr |
| Coordinates | 40.83813, -74.51540 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 6 ft |
| Dam Height | 6 ft |
| Dam Length | 550 ft |
Storage & Hydraulics
| Surface Area | 3 acres |
| Drainage Area | 0 sq mi |
Ownership & Safety
| Purpose | Recreation |
| Owner | Greystone Park Psychiatric Hospital |
| Owner Type | State |
| Hazard Classification | Significant |
| Condition Assessment | Satisfactory |
| Last Inspection | 06/28/2023 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | NJ01001 |
| Federal ID | NJ01001 |
| More Info | State Dam Safety Program |