Twelve Mile Creek Watershed Site 36 Reservoir Report
Last Updated: December 12, 2025
Twelve Mile Creek Watershed Site 36, located in Davis City, Iowa, is a Grade Stabilization dam managed by the USDA NRCS and regulated by the Iowa DNR.
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Summary
Completed in 2003, this Earth dam stands at 31 feet high and spans 550 feet in length, with a storage capacity of 215 acre-feet. The dam serves the primary purpose of Grade Stabilization and is situated along the Tr- Twelve Mile Creek, within a drainage area of 0.73 square miles.
With a low hazard potential and a moderate risk assessment rating, Twelve Mile Creek Watershed Site 36 plays a crucial role in managing water resources in Union County, Iowa. Despite not being rated for condition assessment, the dam is equipped with an uncontrolled spillway and serves as a vital infrastructure for flood control and water management in the region. The site is not under the jurisdiction of any federal agency but receives state inspection, permitting, and enforcement from the Iowa DNR, ensuring its operational integrity and safety for the surrounding community.
Overall, Twelve Mile Creek Watershed Site 36 stands as a testament to the collaborative efforts between local government, regulatory agencies, and the USDA NRCS in safeguarding water resources and promoting sustainable development in the region. As a key infrastructure for Grade Stabilization, this dam contributes to the overall resilience of the Twelve Mile Creek watershed and underscores the importance of effective water management practices in mitigating climate risks and enhancing community safety.
Year Completed |
2003 |
Dam Length |
550 |
Dam Height |
31 |
River Or Stream |
Tr- Twelve Mile Creek |
Primary Dam Type |
Earth |
Surface Area |
7.7 |
Drainage Area |
0.73 |
Nid Storage |
215 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
31 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Thompson River At Davis City
|
22cfs |
East Fork 102 River At Bedford
|
1cfs |
Raccoon River At Van Meter
|
1640cfs |
North River Near Norwalk
|
48cfs |
South Raccoon River At Redfield
|
268cfs |
South River Near Ackworth
|
18cfs |
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 36
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