Ammons Roadgrade Structure Reservoir Report

Last Updated: December 6, 2025

The Ammons Roadgrade Structure in Monroe County, Iowa, was designed by John Goode, the county engineer, and serves as a local grade stabilization project along TR-Moffatt Creek.


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Summary

Completed in 2004, this earth dam stands at a height of 30 feet and stretches 850 feet in length, with a storage capacity of 120 acre-feet and a surface area of 4.8 acres. The dam is regulated by the Iowa Department of Natural Resources and is used for grade stabilization purposes in the region.

Despite being categorized as having a low hazard potential and a moderate risk assessment, the Ammons Roadgrade Structure has not been rated for its condition assessment. As of now, it has not undergone any formal inspection, and there is no emergency action plan in place. However, with state jurisdiction, permitting, and enforcement in place, this structure plays a crucial role in managing water resources and climate considerations in the area. As a focal point for water resource and climate enthusiasts, the Ammons Roadgrade Structure serves as a prime example of local government efforts to ensure environmental sustainability and safety in the face of potential risks.

Year Completed

2004

Dam Length

850

Dam Height

30

River Or Stream

TR- MOFFATT CREEK

Primary Dam Type

Earth

Surface Area

4.8

Drainage Area

0.42

Nid Storage

120

Hazard Potential

Low

Foundations

Soil

Nid Height

30
       
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.