Middle Branch Park River 9
Middle Branch Park River 9 is an earth dam located in Cavalier County, North Dakota, built in 1970. It carries a Significant hazard potential classification.
About Middle Branch Park River 9
The primary purpose of Middle Branch Park River 9 is flood risk reduction. The dam is designed to control downstream flooding by temporarily storing excess water during storms and releasing it at a controlled rate. The dam is owned by Walsh County Wrb (local government). It impounds the Middle Branch Park River-tr near Grafton.
The dam stands 74 feet tall and stretches 1,080 feet across, creates a reservoir covering 9 acres, has a maximum storage capacity of 2,466 acre-feet, and collects water from a drainage area of 7 square miles. Completed in 1970, the structure is well into its service life at over 50 years old.
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. An emergency action plan is in place for this dam. The most recent inspection on record was 05/08/2018.
At 74 feet, this dam is taller than 97% of all dams in the United States.
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Location
| State | North Dakota |
| County | Cavalier |
| Nearest City | Grafton |
| River/Stream | Middle Branch Park River-tr |
| Coordinates | 48.54858, -97.94626 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 74 ft |
| Dam Height | 68 ft |
| Dam Length | 1,080 ft |
| Year Completed | 1970 (56 years old) |
Storage & Hydraulics
| NID Storage | 2,466 acre-ft |
| Max Storage | 2,466 acre-ft |
| Normal Storage | 72 acre-ft |
| Surface Area | 9 acres |
| Drainage Area | 7 sq mi |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Flood Risk Reduction |
| Owner | Walsh County WRB |
| Owner Type | Local Government |
| Hazard Classification | Significant |
| Condition Assessment | Not Rated |
| Last Inspection | 05/08/2018 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | ND00221 |
| Federal ID | ND00221 |
| More Info | State Dam Safety Program |