Twin Ponies Watershed Site 8 Reservoir Report

Last Updated: December 13, 2025

Twin Ponies Watershed Site 8 is a vital water resource site located in Pottawattamie, Iowa, along the TR- Pony Creek.


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Summary

This site, managed by the local government, serves multiple purposes including fire protection, stock, small fish pond, and flood risk reduction. The dam, constructed in 1990 by the USDA NRCS, is an earth dam with a height of 36 feet and a length of 870 feet, providing a storage capacity of 35 acre-feet and covering a surface area of 1 acre.

Despite its low hazard potential, the dam at Twin Ponies Watershed Site 8 is regulated and permitted by the Iowa DNR, with inspections and enforcement in place to ensure its safety and functionality. The site has not been rated for condition assessment, but it has a moderate risk level (3) according to the data. With its strategic location along the Missouri River and the significant drainage area it serves, this watershed site plays a crucial role in managing water resources and mitigating flood risks in the region. For water resource and climate enthusiasts, Twin Ponies Watershed Site 8 offers a fascinating insight into the infrastructure and management of essential water resources in Iowa.

Year Completed

1990

Dam Length

870

Dam Height

36

River Or Stream

TR- PONY CREEK

Primary Dam Type

Earth

Surface Area

1

Drainage Area

1.6

Nid Storage

35

Hazard Potential

Low

Foundations

Soil

Nid Height

36
       
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.