Twelve Mile Creek Watershed Site 62-4 Reservoir Report
Last Updated: December 12, 2025
Twelve Mile Creek Watershed Site 62-4, located in Union County, 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, constructed in 1979 by the USDA NRCS, serves multiple purposes including fire protection, stock, small fish pond maintenance, and flood risk reduction. With a height of 30 feet and a length of 340 feet, the dam has a storage capacity of 81 acre-feet and covers a surface area of 5.3 acres within a drainage area of 0.24 square miles.
Despite being categorized as a low hazard potential structure, the risk assessment for Twelve Mile Creek Watershed Site 62-4 indicates a moderate level of risk. The dam's condition assessment is currently not rated, but it undergoes regular state inspections and enforcement to ensure its structural integrity and functionality. The site has been regulated by the Iowa DNR and complies with state permitting and inspection requirements, demonstrating a commitment to maintaining the safety and efficiency of this essential water management infrastructure in the region.
Twelve Mile Creek Watershed Site 62-4, with its strategic location in Afton, Iowa, plays a crucial role in water resource management along the Twelve Mile Creek tributary. With a designated purpose for fire protection, stock maintenance, and flood risk reduction, this earth dam stands as a testament to sustainable water infrastructure practices. As water resource and climate enthusiasts, monitoring and supporting the maintenance of such structures are essential for ensuring the resilience and longevity of our water systems in the face of changing environmental conditions.
Year Completed |
1979 |
Dam Length |
340 |
Dam Height |
30 |
River Or Stream |
TR-TWELVE MILE CREEK |
Primary Dam Type |
Earth |
Surface Area |
5.3 |
Drainage Area |
0.24 |
Nid Storage |
81 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
30 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
East Fork 102 River At Bedford
|
1cfs |
Thompson River At Davis City
|
22cfs |
Raccoon River At Van Meter
|
1640cfs |
South Raccoon River At Redfield
|
268cfs |
Raccoon River Near West Des Moines
|
1300cfs |
Nodaway River At Clarinda
|
47cfs |
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.
Twelve Mile Creek Watershed Site 62-4