Monument Road Dam Reservoir Report

Last Updated: December 12, 2025

Monument Road Dam, located in Pottawattamie County, Iowa, is a private earth dam completed in 2011 with a primary purpose of recreation.


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Summary

The dam stands at a height of 32 feet and has a storage capacity of 59 acre-feet, providing a surface area of 2.3 acres for recreational activities. Situated on an unnamed tributary to the Missourri River, the dam is regulated by the Iowa DNR and undergoes regular state inspections to ensure its satisfactory condition.

With a high hazard potential and a moderate risk assessment, Monument Road Dam is equipped with a needle outlet gate and an uncontrolled spillway with a width of 3 feet. The dam's maximum discharge capacity is 1200 cubic feet per second, serving as a vital structure in managing water resources in the region. Although no associated structures are present, the dam's strategic location and design by Ehrhart, Griffin, & Associates contribute to its essential role in flood control and water supply management in the area. For water resource and climate enthusiasts, Monument Road Dam serves as a noteworthy example of a privately owned structure that plays a significant role in the local ecosystem and community.

Year Completed

2011

Dam Height

32

River Or Stream

Unnamed Trib to Missourri River

Primary Dam Type

Earth

Surface Area

2.3

Hydraulic Height

32

Drainage Area

0.17

Nid Storage

59

Outlet Gates

Needle

Hazard Potential

High

Foundations

Soil

Nid Height

32
       
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.