Upper Turtle R.fld.ret. 2 is an earth dam located in Grand Forks County, North Dakota, built in 1974. It carries a Low hazard potential classification.
Dam profile
NID height · 62 ft62 ft tall and 2,625 ft long, taller than 95% of U.S. dams with a recorded height. Height is drawn to scale against a ten-story building, about 100 ft; the profile is a generic embankment section and the water level is illustrative.
About Upper Turtle R.fld.ret. 2
The primary purpose of Upper Turtle R.fld.ret. 2 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 Grand Forks County Wrb (local government). It impounds the Skunk Coulee near Niagara.
The dam stands 62 feet tall and stretches 2,625 feet across, creates a reservoir covering 11 acres, has a maximum storage capacity of 1,338 acre-feet, and collects water from a drainage area of 12 square miles. Completed in 1974, 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. The most recent inspection on record was 08/14/2013. That was over 13 years ago.
At 62 feet, this dam is taller than 95% of all dams in the United States.
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Location
| State | North Dakota |
| County | Grand Forks |
| Nearest City | Niagara |
| River/Stream | Skunk Coulee |
| Coordinates | 48.09171, -97.86301 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 62 ft |
| Dam Height | 59 ft |
| Dam Length | 2,625 ft |
| Year Completed | 1974 (52 years old) |
Storage & Hydraulics
| NID Storage | 1,338 acre-ft |
| Max Storage | 1,338 acre-ft |
| Normal Storage | 85 acre-ft |
| Surface Area | 11 acres |
| Drainage Area | 12 sq mi |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Flood Risk Reduction |
| Owner | Grand Forks County Wrb |
| Owner Type | Local Government |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Last Inspection | 08/14/2013 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | ND00387 |
| Federal ID | ND00387 |
| More Info | State Dam Safety Program |