Marsh Dam is an earth dam located in Swift County, Minnesota, built in 1942. It carries a Low hazard potential classification.
Dam profile
NID height · 28 ft28 ft tall and 9,700 ft long, taller than 62% 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 Marsh Dam
The primary purpose of Marsh Dam 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 USACE - St. Paul District (federal). It impounds the Minnesota near Montevideo.
The dam stands 28 feet tall and stretches 9,700 feet across, creates a reservoir covering 5,100 acres, has a maximum storage capacity of 91,000 acre-feet, and collects water from a drainage area of 2,800 square miles. Completed in 1942, the structure is well-established, with more than 75 years of service.
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. An emergency action plan is in place for this dam. The most recent inspection on record was 06/16/2022.
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Location
| State | Minnesota |
| County | Swift |
| Nearest City | Montevideo |
| River/Stream | Minnesota |
| Coordinates | 45.17167, -96.09333 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 28 ft |
| Dam Height | 9 ft |
| Dam Length | 9,700 ft |
| Year Completed | 1942 (84 years old) |
Storage & Hydraulics
| NID Storage | 91,000 acre-ft |
| Max Storage | 91,000 acre-ft |
| Normal Storage | 12,050 acre-ft |
| Surface Area | 5,100 acres |
| Drainage Area | 2,800 sq mi |
| Max Discharge | 2,700 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Flood Risk Reduction |
| Owner | USACE - St. Paul District |
| Owner Type | Federal |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Last Inspection | 06/16/2022 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | MN00579 |
| Federal ID | MN00579 |
| More Info | State Dam Safety Program |