Lost Marsh Wma is an earth dam located in Blue Earth County, Minnesota, built in 1990. It carries a Low hazard potential classification.
Dam profile
NID height · 11 ft11 ft tall and 150 ft long. 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 Lost Marsh Wma
The primary purpose of Lost Marsh Wma is fish and wildlife pond. The dam creates habitat for fish and wildlife, supporting local ecosystems and potentially serving conservation goals. The dam is owned by Mndnr-wildlife (state). It impounds the Little Cobb River-tr near Pemberton.
The dam stands 11 feet tall and stretches 150 feet across, creates a reservoir covering 230 acres, has a maximum storage capacity of 950 acre-feet, and collects water from a drainage area of 4 square miles. Completed in 1990, the structure is 36 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.
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Location
| State | Minnesota |
| County | Blue Earth |
| Nearest City | Pemberton |
| River/Stream | Little Cobb River-tr |
| Coordinates | 43.93969, -93.80163 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 11 ft |
| Dam Height | 7 ft |
| Dam Length | 150 ft |
| Year Completed | 1990 (36 years old) |
Storage & Hydraulics
| NID Storage | 950 acre-ft |
| Max Storage | 950 acre-ft |
| Normal Storage | 600 acre-ft |
| Surface Area | 230 acres |
| Drainage Area | 4 sq mi |
| Max Discharge | 700 cfs |
| Spillway Type | Controlled |
Ownership & Safety
| Purpose | Fish and Wildlife Pond |
| Owner | Mndnr-wildlife |
| Owner Type | State |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Last Inspection | 07/24/2024 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | MN00659 |
| Federal ID | MN00659 |
| More Info | State Dam Safety Program |