East Fork Grand River Watershed Site A-84 Reservoir Report

Last Updated: April 27, 2026

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East Fork Grand River Watershed Site A-84 is a flood risk reduction structure located in Ringgold County, Iowa.


Summary

Managed by the local government and designed by the USDA NRCS, this earth dam stands at 26 feet high and spans 600 feet in length. Completed in 2007, it has a storage capacity of 82 acre-feet and serves the primary purpose of flood risk reduction for the Tr-East Fork Grand River.

With a low hazard potential and a moderate risk assessment score of 3, this dam is regulated by the Iowa Department of Natural Resources and undergoes state permitting, inspection, and enforcement. Despite being uncontrolled, the spillway has a width of 20 feet to manage excess water flow during heavy rainfall events. The structure has not been rated for its condition assessment, but it stands as a crucial infrastructure for managing water resources in the area and mitigating flood risks for the surrounding communities.

15-Day Long Term Forecast


Year Completed

2007

Dam Length

600

Dam Height

26

River Or Stream

Tr-East Fk Grand River

Primary Dam Type

Earth

Surface Area

5

Drainage Area

0.24

Nid Storage

82

Hazard Potential

Low

Foundations

Soil

Nid Height

26
       
Seasonal Comparison

5-Day Hourly Forecast Detail

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.
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