East Fork Grand River Watershed Site A-30 Reservoir Report
Last Updated: December 12, 2025
East Fork Grand River Watershed Site A-30, located in Union County, Iowa, is a local government-owned structure designed by USDA NRCS for flood risk reduction along the TR- SQUAW CREEK.
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Summary
Completed in 2005, this earth dam stands at 22 feet high and stretches 470 feet in length, providing a storage capacity of 127 acre-feet with a normal storage of 32 acre-feet. The dam's spillway type is uncontrolled with a spillway width of 1 foot, and it has a hazard potential rated as low.
Despite not having a condition assessment rating, East Fork Grand River Watershed Site A-30 is regulated by the Iowa DNR and falls under state jurisdiction for permitting, inspection, and enforcement. The structure's risk assessment is classified as moderate, highlighting the importance of ongoing risk management measures. The dam's purpose solely focuses on flood risk reduction, emphasizing its crucial role in protecting the surrounding area from potential inundation events. With its strategic location and design, East Fork Grand River Watershed Site A-30 plays a vital role in water resource management and climate resilience efforts in the region.
Year Completed |
2005 |
Dam Length |
470 |
Dam Height |
22 |
River Or Stream |
TR- SQUAW CREEK |
Primary Dam Type |
Earth |
Surface Area |
7.6 |
Drainage Area |
0.37 |
Nid Storage |
127 |
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-30