Twelve Mile Creek Watershed Site 23 Reservoir Report
Last Updated: December 12, 2025
Located in Union County, Iowa, Twelve Mile Creek Watershed Site 23 is a crucial water resource managed by the local government with oversight from the Iowa Department of Natural Resources.
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Summary
Designed by the USDA NRCS, this site serves multiple purposes, including fire protection, stock watering, and small fish pond management, as well as flood risk reduction. The earth dam, completed in 1988, stands at a height of 33 feet and has a storage capacity of 183 acre-feet, with a normal storage level of 55 acre-feet.
With a surface area of 7.8 acres and a drainage area of 0.56 square miles, this site plays a vital role in managing water resources in the region. The dam's spillway type is uncontrolled, and its hazard potential is rated as low, with a moderate risk assessment score of 3. While the dam's condition is currently not rated, it is subject to regular state inspections, permitting, and enforcement to ensure its safety and functionality. Overall, Twelve Mile Creek Watershed Site 23 is an essential structure for water management and conservation efforts in the area, contributing to both ecological and community needs.
Year Completed |
1988 |
Dam Length |
125 |
Dam Height |
33 |
River Or Stream |
TR- TWELVE MILE CREEK |
Primary Dam Type |
Earth |
Surface Area |
7.8 |
Drainage Area |
0.56 |
Nid Storage |
183 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
33 |
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 |
South River Near Ackworth
|
18cfs |
North River Near Norwalk
|
48cfs |
Middle River Near Indianola
|
48cfs |
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 23