Stennett-Red Oak Watershed Site 18 Reservoir Report

Last Updated: December 14, 2025

Located in Montgomery, Iowa, the Stennett-Red Oak Watershed Site 18 is a vital water resource managed by local government authorities.


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Summary

This site, designed by USDA NRCS, serves multiple purposes including fire protection, stock, small fish pond, and flood risk reduction. Completed in 1971, the earth dam stands at a height of 39 feet and spans 612 feet in length, with a storage capacity of 144 acre-feet and a surface area of 10.4 acres.

Managed by the Iowa Department of Natural Resources, this site is regulated, permitted, inspected, and enforced to ensure its safety and efficacy in water resource management. With a low hazard potential, the dam at Stennett-Red Oak Watershed Site 18 poses a moderate risk, prompting risk management measures to be in place. The site is situated along the TR-Nishnabotna River, contributing to the overall water infrastructure in the area.

As an essential component of the water resource network in Iowa, Stennett-Red Oak Watershed Site 18 plays a crucial role in maintaining water quality, managing flood risk, and supporting local agricultural activities. With its strategic location and state-regulated status, this site serves as a valuable asset in the broader water management efforts in the region. Conservation efforts led by the Natural Resources Conservation Service ensure the long-term sustainability and resilience of this important water resource infrastructure.

Year Completed

1971

Dam Length

612

Dam Height

39

River Or Stream

TR-NISHNABOTNA RIVER

Primary Dam Type

Earth

Surface Area

10.4

Drainage Area

0.59

Nid Storage

144

Hazard Potential

Low

Foundations

Soil

Nid Height

39
       
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.