Big Wyacondah Watershed Site 23 Reservoir Report

Last Updated: December 6, 2025

Big Wyacondah Watershed Site 23, located in Davis, 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 1966 by the USDA NRCS, this earth dam serves multiple purposes including fire protection, stock, small fish pond, and flood risk reduction. With a dam height of 31 feet and a storage capacity of 162 acre-feet, the site covers a surface area of 9 acres and drains a 0.35 square-mile watershed along the TR-South Wyacondah River.

Despite being classified as low hazard potential, the dam at Big Wyacondah Watershed Site 23 is rated as moderate risk (3) due to unspecified factors. Although the condition assessment is currently marked as "Not Rated," the dam is inspected, permitted, and regulated by state authorities, ensuring its structural integrity and safety. In case of emergencies, the site does not have an Emergency Action Plan (EAP) in place, but it meets state guidelines for operation and maintenance. Overall, this watershed site is a significant asset for water management and conservation efforts in the region, providing valuable services to the local community and wildlife.

Year Completed

1966

Dam Length

602

Dam Height

31

River Or Stream

TR-SOUTH WYACONDAH RIVER

Primary Dam Type

Earth

Surface Area

9

Drainage Area

0.35

Nid Storage

162

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.
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