East Fork Grand River Watershed Site A-55 Reservoir Report
Last Updated: December 13, 2025
Located in the heart of Iowa, the East Fork Grand River Watershed Site A-55 is a crucial flood risk reduction structure designed by the USDA NRCS.
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Summary
Completed in 2008, this earth dam stands at a height of 22 feet and spans 473 feet in length, providing a storage capacity of 156 acre-feet to mitigate potential flooding in the area. Situated in Union County, Iowa, this site plays a vital role in protecting the surrounding community from the impacts of extreme weather events.
Managed by the Iowa DNR, this state-regulated dam is categorized as having a low hazard potential with a moderate risk assessment rating. With a primary purpose of flood risk reduction, this structure ensures the safety and resilience of the East Fork Grand River watershed. Although not currently rated for condition assessment, this dam continues to serve as a critical infrastructure asset in safeguarding the local environment and communities from the adverse effects of climate change.
Despite its remote location, the East Fork Grand River Watershed Site A-55 serves as a testament to the importance of sustainable water resource management and climate adaptation strategies. With its strategic design and operational capabilities, this dam exemplifies the collaborative efforts between local government agencies and federal entities in enhancing the resilience of vulnerable regions to the impacts of a changing climate.
Year Completed |
2008 |
Dam Length |
473 |
Dam Height |
22 |
River Or Stream |
TR- EAST FORK GRAND RIVER |
Primary Dam Type |
Earth |
Surface Area |
10.3 |
Drainage Area |
0.49 |
Nid Storage |
156 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
22 |
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-55