Amiret 33 & Monroe 4 Reservoir Report
Nearby: Twp Road 30 East Amiret Twp 32
Last Updated: December 13, 2025
Amiret 33 & Monroe 4 is a dam located in Lyon County, Minnesota, along the Cottonwood River.
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Summary
Owned by the local government, this dam stands at a height of 15 feet and has a length of 380 feet. The dam has a storage capacity of 121 acre-feet and serves as a roadway retention structure. It is regulated by the Minnesota Department of Natural Resources and undergoes regular inspections to ensure its safety and compliance with state regulations.
The structure is classified as a Buttress dam with an unlisted/unknown foundation type. Despite its low hazard potential, the dam's condition assessment is currently listed as "Not Rated" as of the last inspection in April 2019. Emergency action plans and risk assessment measures for the dam have not been updated or prepared, highlighting the need for continued monitoring and evaluation of the structure's safety and functionality. With its location in a critical watershed area, the Amiret 33 & Monroe 4 dam plays a crucial role in water resource management and flood control efforts in the region.
Water resource and climate enthusiasts can appreciate the significance of the Amiret 33 & Monroe 4 dam in Lyon County, Minnesota. As a key infrastructure owned and regulated by the local government, this structure helps to manage water flow along the Cottonwood River and provides important retention functions for surrounding roadways. With a storage capacity of 121 acre-feet, the dam plays a vital role in flood control and water resource management in the area. Continued monitoring and inspection of the dam will be essential to ensure its safety and effectiveness in the face of changing climate patterns and water resource demands.
Dam Length |
380 |
Dam Height |
15 |
River Or Stream |
COTTONWOOD RIVER-TR |
Drainage Area |
8 |
Nid Storage |
121 |
Hazard Potential |
Low |
Foundations |
Unlisted/Unknown |
Nid Height |
15 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
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.
Area Campgrounds
| Location | Reservations | Toilets |
|---|---|---|
Swift Lake Park
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Garvin CP- Lower Campground
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Garvin CP - Upper Campground
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Sundquist Park at West Lake Sarah
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Amiret 33 & Monroe 4