East Fork Grand River Watershed Site A-83 Reservoir Report
Last Updated: December 13, 2025
Located in the East Fork Grand River Watershed in Ringgold County, Iowa, Site A-83 is a flood risk reduction structure designed by the USDA NRCS and completed in 2006.
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Summary
This earth dam stands at a height of 25 feet and spans 655 feet in length, with a storage capacity of 104 acre-feet and a drainage area of 0.32 square miles. The dam serves to mitigate flooding risks along the Tr-East Fk Grand River, with a spillway width of 20 feet to manage excess water flow.
Owned and regulated by the Iowa Department of Natural Resources, Site A-83 is classified as having a low hazard potential and a moderate risk assessment score of 3. While the dam's condition assessment is currently marked as "Not Rated," it is subject to state permitting, inspection, and enforcement to ensure its structural integrity and operational effectiveness. Despite its proximity to the State of Missouri, the dam is under the jurisdiction of Iowa and falls within the Rock Island District of the US Army Corps of Engineers.
For water resource and climate enthusiasts, East Fork Grand River Watershed Site A-83 offers a fascinating case study in flood management and infrastructure development. With its strategic location and purposeful design, this dam plays a crucial role in safeguarding local communities from potential flood events while contributing to the overall resilience of the watershed. As a part of a larger network of water management structures, Site A-83 highlights the importance of proactive risk assessment, maintenance, and regulatory oversight in ensuring the long-term sustainability of our water resources in the face of changing climate conditions.
Year Completed |
2006 |
Dam Length |
655 |
Dam Height |
25 |
River Or Stream |
Tr-East Fk Grand River |
Primary Dam Type |
Earth |
Surface Area |
6 |
Drainage Area |
0.32 |
Nid Storage |
104 |
Hazard Potential |
Low |
Nid Height |
25 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Dam Data Reference
Condition Assessment
SatisfactoryNo 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
HighDams 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.
East Fork Grand River Watershed Site A-83