Warren St Detention is an earth dam located in Blue Earth County, Minnesota, built in 1997. It carries a Low hazard potential classification.
Dam profile
NID height · 45 ft45 ft tall and 150 ft long, taller than 90% 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 Warren St Detention
The primary purpose of Warren St 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 City of Mankato (local government). It impounds the Minnesota River-tr near Mankato.
The dam stands 45 feet tall and stretches 150 feet across, creates a reservoir covering 3 acres, has a maximum storage capacity of 30 acre-feet, and collects water from a drainage area of 1 square miles. Completed in 1997, the structure is 29 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 07/24/2024.
At 45 feet, this dam is taller than 90% of dams nationwide.
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Location
| State | Minnesota |
| County | Blue Earth |
| Nearest City | Mankato |
| River/Stream | Minnesota River-tr |
| Coordinates | 44.14101, -93.99348 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 45 ft |
| Dam Height | 44 ft |
| Dam Length | 150 ft |
| Year Completed | 1997 (29 years old) |
Storage & Hydraulics
| NID Storage | 30 acre-ft |
| Max Storage | 30 acre-ft |
| Normal Storage | 1 acre-ft |
| Surface Area | 3 acres |
| Drainage Area | 1 sq mi |
| Max Discharge | 50 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Flood Risk Reduction |
| Owner | City of Mankato |
| Owner Type | Local Government |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Last Inspection | 07/24/2024 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | MN01385 |
| Federal ID | MN01385 |
| More Info | State Dam Safety Program |