Eidsvold 31 & 32 N Reservoir Report
Last Updated: December 13, 2025
Eidsvold 31 & 32 N is a rockfill dam located in Lyon, Minnesota, along the Yellow Medicine River-TR, with the primary purpose of flood risk reduction.
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Summary
Owned and regulated by the local government, this dam stands at a height of 20 feet and has a storage capacity of 141 acre-feet. Despite its low hazard potential, the dam has not been rated for its condition assessment as of yet.
The dam, designed by ROADWAY RETENTION, is inspected every 8 years to ensure its structural integrity and functionality. With state permitting, inspection, and enforcement in place, Eidsvold 31 & 32 N is equipped to handle potential flood events and protect the surrounding area. Although it has not been modified in recent years, the dam continues to serve its purpose effectively in mitigating flood risks along the Yellow Medicine River-TR.
With Collin Peterson (D) as the representative for the area, Eidsvold 31 & 32 N plays a crucial role in the water resource management of Lyon, Minnesota. As climate change continues to impact weather patterns and increase the frequency of extreme events, structures like this rockfill dam are essential for safeguarding communities and infrastructure from flood-related risks.
Dam Length |
1500 |
Dam Height |
20 |
River Or Stream |
YELLOW MEDICINE RIVER-TR |
Primary Dam Type |
Rockfill |
Drainage Area |
1.1 |
Nid Storage |
141 |
Hazard Potential |
Low |
Foundations |
Unlisted/Unknown |
Nid Height |
20 |
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.
Eidsvold 31 & 32 N