Three Mile Creek Watershed Site 63 Reservoir Report
Last Updated: December 12, 2025
Three Mile Creek Watershed Site 63 in Adair, Iowa, is a vital water resource managed by the local government with oversight from the Iowa Department of Natural Resources.
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Summary
This earth dam, completed in 1968, serves multiple purposes including fire protection, stock, and small fish pond, as well as flood risk reduction. With a dam height of 33 feet and a storage capacity of 159 acre-feet, the site covers a surface area of 10 acres and has a drainage area of 0.31 square miles.
Located along TR-Three Mile Creek, this low hazard potential structure is designed by USDA NRCS and falls under the jurisdiction of the Iowa DNR. Despite being uncontrolled, the spillway type poses a moderate risk with a risk assessment rating of 3. The condition of the dam is not rated, and emergency preparedness measures such as an Emergency Action Plan (EAP) and inundation maps are currently not in place. Overall, Three Mile Creek Watershed Site 63 is a key component in managing water resources and reducing flood risks in the area, highlighting the importance of sustainable water management practices for climate enthusiasts and stakeholders in the region.
Year Completed |
1968 |
Dam Length |
422 |
Dam Height |
33 |
River Or Stream |
TR-THREE MILE CREEK |
Primary Dam Type |
Earth |
Surface Area |
10 |
Drainage Area |
0.31 |
Nid Storage |
159 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
33 |
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 |
North River Near Norwalk
|
48cfs |
East Fork 102 River At Bedford
|
1cfs |
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 63