Three Mile Creek Watershed Site 14-G Reservoir Report

Last Updated: December 11, 2025

Three Mile Creek Watershed Site 14-G is a dam located in Union County, Iowa, specifically in the city of Talmage.


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Summary

Built in 1970 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 31 feet and a length of 465 feet, the dam has a storage capacity of 76 acre-feet and covers a surface area of 5.7 acres, draining an area of 0.3 square miles.

Managed by the Iowa DNR, this site is regulated, permitted, inspected, and enforced by state agencies to ensure compliance with safety standards. Classified as having a low hazard potential with a moderate risk rating, the dam has not been conditionally assessed or rated. While there is no emergency action plan (EAP) in place, the dam meets guidelines for risk management measures. Overall, Three Mile Creek Watershed Site 14-G is a crucial infrastructure for water resource management and climate resilience in the region, contributing to the protection of local communities and ecosystems from potential flooding events.

Year Completed

1970

Dam Length

465

Dam Height

31

River Or Stream

TR-TWO MILE CREEK

Primary Dam Type

Earth

Surface Area

5.7

Drainage Area

0.3

Nid Storage

76

Hazard Potential

Low

Foundations

Soil

Nid Height

31
       
Seasonal Comparison

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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.