Monroe Twp 8 Reservoir Report

Last Updated: December 13, 2025

Monroe Twp 8, located in Lambertson, Minnesota, is a privately owned dam managed by AREA II MN RIVER BASIN PROJECTS, INC.


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Summary

Completed in 2010, this earth dam stands at a height of 39 feet with a hydraulic height of 13 feet, serving primarily for flood risk reduction along the Cottonwood River. With a storage capacity of 400 acre-feet and a surface area of 2.5 acres, Monroe Twp 8 plays a crucial role in mitigating potential flooding in the area.

Despite being classified as low hazard potential, Monroe Twp 8 is regulated, permitted, inspected, and enforced by the Minnesota Department of Natural Resources. The dam's condition was last assessed in 2014 and deemed satisfactory, with inspection frequency set at every 8 years. The dam has a spillway width of 160 feet and is designed to handle maximum discharge effectively, ensuring the safety and security of the surrounding community in case of heavy rainfall or extreme weather events.

Monroe Twp 8, with its efficient flood risk reduction capabilities and satisfactory condition assessment, stands as a vital infrastructure in Lyon County, Minnesota. Its strategic location, design, and management by private entities highlight the collaborative efforts in water resource management and climate resilience, aligning with state regulatory standards and ensuring the safety of the community and environment in the face of potential natural disasters.

Year Completed

2010

Dam Length

400

Dam Height

39

River Or Stream

COTTONWOOD RIVER-TR

Primary Dam Type

Earth

Surface Area

2.5

Hydraulic Height

13

Drainage Area

6

Nid Storage

400

Hazard Potential

Low

Foundations

Unlisted/Unknown

Nid Height

39
       
Seasonal Comparison

Weather Forecast

Dam Data Reference

Condition Assessment

Satisfactory
No 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

High
Dams 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.