Twp Road 87 Reservoir Report
Last Updated: December 12, 2025
Twp Road 87 is a flood risk reduction structure located in Marshall, Minnesota, along the Yellow Medicine River.
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Summary
Completed in 1995, this earth dam stands at a height of 15 feet and has a total length of 400 feet. With a storage capacity of 300 acre-feet, it serves the primary purpose of mitigating flood risks in the area. The dam is state-regulated and undergoes regular inspections to ensure its satisfactory condition.
Owned by the local government, Twp Road 87 is designed to handle a maximum discharge of 2300 cubic feet per second and has a low hazard potential. The structure is equipped with uncontrolled spillways and outlet gates, with a spillway width of 12 feet. Despite its moderate risk assessment, the dam has been deemed satisfactory in terms of condition. It is located in Lincoln County, Minnesota, and falls under the jurisdiction of the Minnesota Department of Natural Resources for regulation, permitting, inspection, and enforcement.
Water resource and climate enthusiasts will find Twp Road 87 to be a fascinating example of flood risk reduction infrastructure in Minnesota. Its location along the Yellow Medicine River, its design characteristics, and its regulatory oversight by state agencies make it a crucial component in managing water resources in the region. With its low hazard potential and satisfactory condition assessment, Twp Road 87 stands as a reliable structure for protecting the surrounding area from potential flooding events.
Year Completed |
1995 |
Dam Length |
400 |
Dam Height |
15 |
River Or Stream |
YELLOW MEDICINE RIVER S B |
Primary Dam Type |
Earth |
Surface Area |
2 |
Drainage Area |
38 |
Nid Storage |
300 |
Structural Height |
17 |
Outlet Gates |
Uncontrolled |
Hazard Potential |
Low |
Foundations |
Unlisted/Unknown |
Nid Height |
17 |
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.
Twp Road 87