Twelve Mile Creek Watershed Site 18 Reservoir Report
Last Updated: December 12, 2025
Twelve Mile Creek Watershed Site 18, located in Westerville, Iowa, is a crucial water resource managed by the local government with oversight from the Iowa Department of Natural Resources.
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Summary
Built in 1986 by the USDA NRCS, this earth dam serves multiple purposes including fire protection, stock, small fish pond, and flood risk reduction. With a height of 36 feet and a storage capacity of 190 acre-feet, the dam plays a vital role in managing water flow and providing essential services to the surrounding community.
Despite being classified as having low hazard potential, the dam at Site 18 is considered to have a moderate risk level, indicating the need for ongoing monitoring and maintenance. The structure has not been rated for its condition, but regular inspections and assessments are conducted to ensure its reliability and safety. While there are currently no emergency action plans in place, the site is equipped to handle potential risks and respond effectively in case of emergencies.
The Twelve Mile Creek Watershed Site 18 is a significant feature within the Union County water infrastructure, contributing to water conservation efforts and serving as a vital resource for the community. With its strategic location and multiple functionalities, this site showcases the importance of sustainable water management practices and the need for continued investment in maintaining and improving water resources in the region.
Year Completed |
1986 |
Dam Length |
510 |
Dam Height |
36 |
River Or Stream |
TR-TWELVE MILE CREEK |
Primary Dam Type |
Earth |
Surface Area |
8 |
Drainage Area |
0.68 |
Nid Storage |
190 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
36 |
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 18