Prairie Trail - Cp5 Reservoir Report

Last Updated: December 11, 2025

Prairie Trail - Cp5 is a vital flood risk reduction structure located in Ankeny, Iowa.


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Summary

Owned and regulated by the local government, this earth dam stands at a height of 24 feet and was completed in 2014. With a storage capacity of 61 acre-feet, it serves the primary purpose of flood risk reduction for the surrounding area, offering protection against potential inundation from heavy rainfall or rising water levels.

Designed by Snyder and Associates, Prairie Trail - Cp5 plays a crucial role in safeguarding the community from significant hazards posed by flooding. With a hydraulic height of 24 feet and a maximum discharge capacity of 1070 cubic feet per second, this structure is equipped to handle large volumes of water during extreme weather events. The dam's condition assessment is currently listed as "Not Rated," indicating the need for ongoing monitoring and maintenance to ensure its effectiveness in mitigating flood risks.

Located in Polk County, Iowa, Prairie Trail - Cp5 is a key component of the local flood risk management infrastructure. With its stone core and soil foundation, this earth dam covers a surface area of 2 acres and serves a drainage area of 0.38 square miles. As a significant hazard potential structure, regular inspections and risk management measures are essential to maintaining the dam's integrity and protecting the community from potential flooding events.

Year Completed

2014

Dam Height

24

Primary Dam Type

Earth

Surface Area

2

Hydraulic Height

24

Drainage Area

0.38

Nid Storage

61

Structural Height

24

Outlet Gates

None

Hazard Potential

Significant

Foundations

Soil

Nid Height

24
       
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.