Knott Detention is an earth dam located in Redwood County, Minnesota, built in 1977. It carries a Low hazard potential classification and has a satisfactory condition assessment.
Dam profile
NID height · 44 ft44 ft tall and 570 ft long, taller than 89% of U.S. dams with a recorded height. Height is drawn to scale against a two-story house, about 25 ft; the profile is a generic embankment section and the water level is illustrative.
About Knott Detention
The primary purpose of Knott Detention 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 Knott, Arlen & Constance (private). It impounds the Cottonwood River-tr near Sanborn.
The dam stands 44 feet tall and stretches 570 feet across, creates a reservoir covering 6 acres, has a maximum storage capacity of 261 acre-feet, and collects water from a drainage area of 2 square miles. Completed in 1977, the structure is 49 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 satisfactory, indicating no existing or potential dam safety deficiencies are recognized. The most recent inspection on record was 03/14/2016. That was over 10 years ago.
At 44 feet, this dam is taller than 89% of dams nationwide.
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Location
| State | Minnesota |
| County | Redwood |
| Nearest City | Sanborn |
| River/Stream | Cottonwood River-tr |
| Coordinates | 44.29587, -95.42182 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 44 ft |
| Dam Height | 32 ft |
| Dam Length | 570 ft |
| Year Completed | 1977 (49 years old) |
Storage & Hydraulics
| NID Storage | 261 acre-ft |
| Max Storage | 261 acre-ft |
| Normal Storage | 63 acre-ft |
| Surface Area | 6 acres |
| Drainage Area | 2 sq mi |
| Max Discharge | 686 cfs |
Ownership & Safety
| Purpose | Flood Risk Reduction |
| Owner | Knott, Arlen & Constance |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Satisfactory |
| Last Inspection | 03/14/2016 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | MN00729 |
| Federal ID | MN00729 |
| More Info | State Dam Safety Program |