Three Mile Creek Watershed Site 14-P Reservoir Report

Last Updated: December 11, 2025

Three Mile Creek Watershed Site 14-P in Union County, Iowa, is a crucial water resource managed by local government authorities with oversight from the Iowa Department of Natural Resources.


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Summary

The dam at this site, designed by USDA NRCS and completed in 1976, serves multiple purposes including fire protection, stock watering, and flood risk reduction. With a height of 23 feet and a storage capacity of 86 acre-feet, the dam helps regulate water flow in the TR-Two Mile Creek, contributing to the overall water management efforts in the area.

Despite its low hazard potential and moderate risk assessment, Three Mile Creek Watershed Site 14-P has not been rated for its condition assessment. Nevertheless, the dam plays a significant role in maintaining water quality and quantity in the region, especially during periods of heavy rainfall or flooding. Its uncontrolled spillway and earth dam construction make it a valuable asset for the community, ensuring water security for various uses including agriculture, recreation, and environmental conservation.

Overall, Three Mile Creek Watershed Site 14-P stands as a testament to effective water resource management and climate resilience efforts in Union County, Iowa. With its strategic location, regulated by state authorities and monitored for safety, the dam at this site remains an essential infrastructure for safeguarding the surrounding environment and supporting sustainable water practices in the region.

Year Completed

1976

Dam Length

565

Dam Height

23

River Or Stream

TR-TWO MILE CREEK

Primary Dam Type

Earth

Surface Area

6.9

Drainage Area

0.2

Nid Storage

86

Hazard Potential

Low

Foundations

Soil

Nid Height

23
       
Seasonal Comparison

Weather Forecast

Dam Data Reference

Condition Assessment

Satisfactory
No 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

High
Dams 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.