Twelve Mile Creek Watershed Site 68-2 Reservoir Report
Last Updated: December 15, 2025
Twelve Mile Creek Watershed Site 68-2 is a vital water resource in Union County, Iowa, designed by the USDA NRCS for fire protection, stock, and small fish pond purposes.
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Summary
Completed in 1979, this earth dam stands at a height of 25 feet and spans 650 feet, with a storage capacity of 115 acre-feet. The dam serves as a flood risk reduction measure for the surrounding area, with a drainage area of 0.42 square miles and a surface area of 6.3 acres.
Located in Afton, Iowa, this dam on Twelve Mile Creek is regulated by the Iowa DNR, with state permitting, inspection, and enforcement in place to ensure its safety and functionality. The dam is classified as having a low hazard potential and a moderate risk level, indicating the need for continued monitoring and risk management measures. With a controlled spillway type and uncontrolled spillway width, the dam plays a crucial role in managing water flow and protecting downstream areas from flooding events.
Managed by the local government, Twelve Mile Creek Watershed Site 68-2 is a significant asset for water resource and climate enthusiasts in the region. Its construction and ongoing maintenance reflect a commitment to water management and environmental stewardship, highlighting the importance of strategic infrastructure for safeguarding communities against the impacts of extreme weather events.
Year Completed |
1979 |
Dam Length |
650 |
Dam Height |
25 |
River Or Stream |
TR-TWELVE MILE CREEK |
Primary Dam Type |
Earth |
Surface Area |
6.3 |
Drainage Area |
0.42 |
Nid Storage |
115 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
25 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
East Fork 102 River At Bedford
|
1cfs |
South Raccoon River At Redfield
|
268cfs |
Raccoon River At Van Meter
|
1640cfs |
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 68-2