East Fork Grand River Watershed Site A-37 Reservoir Report
Last Updated: December 13, 2025
East Fork Grand River Watershed Site A-37 in Union, Iowa, is a vital flood risk reduction infrastructure designed by the USDA NRCS with a dam height of 24 feet and a length of 470 feet.
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Summary
Completed in 2005, this earth dam plays a crucial role in managing the flow of TR- SQUAW CREEK, with a storage capacity of 68 acre-feet and a surface area of 2.8 acres. Despite its low hazard potential, the dam is regulated by the Iowa DNR and undergoes regular inspections, enforcement, and permitting to ensure its effectiveness in flood risk mitigation.
Located in the Rock Island District and owned by the local government, East Fork Grand River Watershed Site A-37 is designated for flood risk reduction purposes. With a moderate risk assessment rating, this dam serves as a key component in safeguarding the surrounding area from potential inundation and damage during heavy rainfall events. Although the condition assessment is currently not rated, the infrastructure's operational and regulatory aspects are closely monitored to uphold its functionality and safety standards.
East Fork Grand River Watershed Site A-37 stands as a resilient structure in the landscape of water resource management, contributing to the overall climate resilience of the region. As a part of the broader network of flood risk reduction infrastructure, this dam plays a crucial role in protecting communities and ecosystems along TR- SQUAW CREEK. With its strategic location and design, coupled with state-of-the-art regulatory oversight, the site exemplifies a harmonious balance between human intervention and natural processes, ensuring sustainable water resource management in Union, Iowa.
Year Completed |
2005 |
Dam Length |
470 |
Dam Height |
24 |
River Or Stream |
TR- SQUAW CREEK |
Primary Dam Type |
Earth |
Surface Area |
2.8 |
Drainage Area |
0.2 |
Nid Storage |
68 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
24 |
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-37