Three Mile Creek Watershed Site 58 Reservoir Report
Nearby: Claiser Dam Downing Dam
Last Updated: December 12, 2025
Three Mile Creek Watershed Site 58 is a key water resource site located in Union, Iowa, specifically in the city of Afton.
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Summary
Managed by the USDA NRCS, this site serves multiple purposes including fire protection, stock, small fish pond, and flood risk reduction. The primary dam is of earth type, standing at 32 feet in height with a length of 469 feet, completed in 1968.
With a low hazard potential and moderate risk assessment, Three Mile Creek Watershed Site 58 showcases the importance of proper water resource management in the region. State-regulated and inspected by the Iowa DNR, this site plays a crucial role in maintaining water quality and flood control in the area. Enthusiasts of water resources and climate will find this site's data and features intriguing for understanding the intersection of human infrastructure and environmental stewardship in Iowa.
Year Completed |
1968 |
Dam Length |
469 |
Dam Height |
32 |
River Or Stream |
TR-THREE MILE CREEK |
Primary Dam Type |
Earth |
Surface Area |
5.8 |
Drainage Area |
0.22 |
Nid Storage |
73 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
32 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
South Raccoon River At Redfield
|
268cfs |
Raccoon River At Van Meter
|
1640cfs |
Middle Raccoon River At Panora
|
92cfs |
Raccoon River Near West Des Moines
|
1300cfs |
East Fork 102 River At Bedford
|
1cfs |
North River Near Norwalk
|
48cfs |
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.
Three Mile Creek Watershed Site 58