Lost Marsh Wma Reservoir Report
Nearby: Cottonwood Lake Perch Lake
Last Updated: December 6, 2025
Lost Marsh WMA is a state-owned wildlife management area located in Blue Earth, Minnesota, near the city of Pemberton.
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Summary
The site is home to a fish and wildlife pond created by an earth dam, with a maximum storage capacity of 950 acre-feet and a surface area of 230 acres. The dam, completed in 1990, stands at a height of 11 feet and serves to regulate the flow of the Little Cobb River-TR.
Despite its low hazard potential and satisfactory condition assessment, Lost Marsh WMA is subject to state regulation, inspection, and enforcement by the Minnesota Department of Natural Resources. The area offers a tranquil habitat for various wildlife species and serves as a recreational space for visitors interested in birdwatching, fishing, and nature exploration. The site's risk assessment is categorized as very high, emphasizing the importance of responsible management and maintenance practices to ensure the safety and longevity of the dam structure.
With its picturesque surroundings and vital role in supporting local biodiversity, Lost Marsh WMA stands as a testament to the intersection of water resource management and conservation efforts. As climate change continues to impact ecosystems worldwide, this sanctuary serves as a reminder of the importance of protecting and preserving our natural resources for future generations. Whether you're a water resource enthusiast or a climate advocate, Lost Marsh WMA offers a unique opportunity to connect with nature and appreciate the delicate balance between human activity and environmental sustainability.
Year Completed |
1990 |
Dam Length |
150 |
Dam Height |
7 |
River Or Stream |
LITTLE COBB RIVER-TR |
Primary Dam Type |
Earth |
Surface Area |
230 |
Hydraulic Height |
3.9 |
Drainage Area |
4 |
Nid Storage |
950 |
Structural Height |
11 |
Hazard Potential |
Low |
Foundations |
Unlisted/Unknown |
Nid Height |
11 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Le Sueur River Near Rapidan
|
179cfs |
Blue Earth River Near Rapidan
|
328cfs |
Minnesota River At Mankato
|
2870cfs |
Watonwan River Near Garden City
|
82cfs |
Little Cottonwood River Near Courtland
|
33cfs |
Straight River Near Faribault
|
83cfs |
Dam Data Reference
Condition Assessment
SatisfactoryNo existing or potential dam safety deficiencies are recognized. Acceptable performance is expected under all loading conditions (static, hydrologic, seismic) in accordance with the minimum applicable state or federal regulatory criteria or tolerable risk guidelines.
Fair
No existing dam safety deficiencies are recognized for normal operating conditions. Rare or extreme hydrologic and/or seismic events may result in a dam safety deficiency. Risk may be in the range to take further action. Note: Rare or extreme event is defined by the regulatory agency based on their minimum
Poor A dam safety deficiency is recognized for normal operating conditions which may realistically occur. Remedial action is necessary. POOR may also be used when uncertainties exist as to critical analysis parameters which identify a potential dam safety deficiency. Investigations and studies are necessary.
Unsatisfactory
A dam safety deficiency is recognized that requires immediate or emergency remedial action for problem resolution.
Not Rated
The dam has not been inspected, is not under state or federal jurisdiction, or has been inspected but, for whatever reason, has not been rated.
Not Available
Dams for which the condition assessment is restricted to approved government users.
Hazard Potential Classification
HighDams assigned the high hazard potential classification are those where failure or mis-operation will probably cause loss of human life.
Significant
Dams assigned the significant hazard potential classification are those dams where failure or mis-operation results in no probable loss of human life but can cause economic loss, environment damage, disruption of lifeline facilities, or impact other concerns. Significant hazard potential classification dams are often located in predominantly rural or agricultural areas but could be in areas with population and significant infrastructure.
Low
Dams assigned the low hazard potential classification are those where failure or mis-operation results in no probable loss of human life and low economic and/or environmental losses. Losses are principally limited to the owner's property.
Undetermined
Dams for which a downstream hazard potential has not been designated or is not provided.
Not Available
Dams for which the downstream hazard potential is restricted to approved government users.
Lost Marsh Wma