Twelve Mile Creek Watershed Site 72-2 Reservoir Report
Last Updated: December 12, 2025
Twelve Mile Creek Watershed Site 72-2, located in Afton, Iowa, is a dam constructed in 1979 by the USDA NRCS with the primary purpose of fire protection, stock, or small fish pond.
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Summary
This earth dam stands at a height of 23 feet and spans 350 feet, with a storage capacity of 93 acre-feet. The dam serves as a critical infrastructure for flood risk reduction in the area, with a drainage area of 0.37 square miles and a surface area of 5.5 acres.
Managed by the Iowa DNR, this site is regulated and permitted for operation, inspection, and enforcement to ensure its functionality and safety. With a low hazard potential and a moderate risk assessment rating, this dam plays a crucial role in water resource management in the Twelve Mile Creek watershed. Despite its condition assessment being not rated, ongoing risk management measures are in place to address any potential issues and ensure the safety and efficacy of the structure.
As a key component of the Union, Iowa community's water resource infrastructure, Twelve Mile Creek Watershed Site 72-2 is a testament to the collaborative efforts between local government entities and federal agencies in safeguarding the area against flooding and ensuring sustainable water management practices. With its strategic location and purposeful design, this dam remains a vital asset in protecting the surrounding environment and supporting the diverse needs of the region's residents and wildlife.
Year Completed |
1979 |
Dam Length |
350 |
Dam Height |
23 |
River Or Stream |
TR-TWELVE MILE CREEK |
Primary Dam Type |
Earth |
Surface Area |
5.5 |
Drainage Area |
0.37 |
Nid Storage |
93 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
23 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
South Raccoon River At Redfield
|
268cfs |
Raccoon River At Van Meter
|
1640cfs |
East Fork 102 River At Bedford
|
1cfs |
Thompson River At Davis City
|
22cfs |
Raccoon River Near West Des Moines
|
1300cfs |
Middle Raccoon River At Panora
|
92cfs |
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 72-2