Washington Co Road Dam 26-74-9 Reservoir Report

Last Updated: December 6, 2025

Washington CO Road Dam 26-74-9, located in Coppock, Iowa, is a local government-owned structure designed by the Washington County Engineer.


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Summary

Completed in 2005, this earth dam stands at a height of 31 feet and spans 750 feet along TR- Honey Creek. Its primary purpose is grade stabilization, serving to control water flow and prevent erosion in the area. With a normal storage capacity of 11 acre-feet and a drainage area of 0.12 square miles, this dam plays a crucial role in managing water resources in the region.

Managed by the Iowa Department of Natural Resources, Washington CO Road Dam 26-74-9 is classified as a low hazard potential structure with a moderate risk assessment rating. While the dam is not currently rated for condition assessment, it undergoes state inspection, permitting, and enforcement to ensure its safety and functionality. The spillway, with a width of 3 feet, is uncontrolled, and the dam is constructed on a soil foundation, providing stability for its operations. Despite its low hazard potential, the dam contributes to the overall water management efforts in Washington County and helps mitigate potential risks associated with flooding and erosion.

This dam, situated within the Rock Island District, serves as a vital infrastructure for water resource management in the area. While it has not been modified since its completion, the structure continues to fulfill its intended purpose of grade stabilization along TR- Honey Creek. With its strategic location and design, Washington CO Road Dam 26-74-9 exemplifies the importance of maintaining and monitoring dams to safeguard water resources and address climate-related challenges in the region.

Year Completed

2005

Dam Length

750

Dam Height

31

River Or Stream

TR- HONEY CREEK

Primary Dam Type

Earth

Surface Area

1.9

Drainage Area

0.12

Nid Storage

36

Hazard Potential

Low

Foundations

Soil

Nid Height

31
       
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.