East Fork Grand River Watershed Site A-35 Reservoir Report
Last Updated: December 13, 2025
East Fork Grand River Watershed Site A-35 is a crucial flood risk reduction structure located in Union, Iowa.
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Summary
Designed by the USDA NRCS and completed in 2011, this earth dam stands at 25 feet tall and stretches 590 feet in length. With a storage capacity of 152 acre-feet, it serves to stabilize grades and reduce the risk of flooding in the area.
Situated in close proximity to Tr to Hackberry Creek, this dam plays a vital role in protecting the surrounding community from potential hazards. With a low hazard potential and a condition assessment that is currently not rated, this structure is maintained by the Iowa Department of Natural Resources. The dam's primary purpose is flood risk reduction, and it has a normal storage capacity of 37 acre-feet, covering a drainage area of 0.48 square miles.
Managed by the local government, East Fork Grand River Watershed Site A-35 showcases the collaborative efforts between various agencies to ensure the safety and well-being of the residents in Union, Iowa. With state regulation, permitting, inspection, and enforcement in place, this dam stands as a testament to proactive measures taken to mitigate the impact of extreme weather events and safeguard water resources in the region.
Year Completed |
2011 |
Dam Length |
590 |
Dam Height |
25 |
River Or Stream |
Tr to Hackberry Creek |
Primary Dam Type |
Earth |
Surface Area |
7 |
Drainage Area |
0.48 |
Nid Storage |
152 |
Outlet Gates |
None |
Hazard Potential |
Low |
Foundations |
Soil |
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-35