East Fork Grand River Watershed Site A-121 Reservoir Report
Last Updated: December 13, 2025
East Fork Grand River Watershed Site A-121 is a significant location in the state of Iowa, managed by the local government and designed by USDA NRCS.
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Summary
This site plays a crucial role in flood risk reduction for the surrounding area, with a primary dam type of Earth and a height of 28 feet. Completed in 2010, the dam has a storage capacity of 89 acre-feet and serves multiple purposes including fish and wildlife pond creation, grade stabilization, and recreation.
Located in Ringgold County, Iowa, the dam spans 570 feet and covers a drainage area of 0.27 square miles. Despite its low hazard potential, the structure has not been formally assessed for condition, with inspection frequency and emergency preparedness measures yet to be determined. With a maximum discharge capacity of 154 cubic feet per second and a normal storage volume of 26 acre-feet, the dam provides essential protection for the area while also offering recreational opportunities for residents.
Managed by the Iowa DNR and situated in the Rock Island District, East Fork Grand River Watershed Site A-121 stands as a testament to effective water resource management and climate resilience efforts. As an integral part of the local ecosystem, this site showcases the importance of sustainable infrastructure development in safeguarding communities against the impacts of extreme weather events and preserving natural habitats for future generations.
Year Completed |
2010 |
Dam Length |
570 |
Dam Height |
28 |
River Or Stream |
Trib to E. Fork Grand River |
Primary Dam Type |
Earth |
Surface Area |
5 |
Drainage Area |
0.27 |
Nid Storage |
89 |
Outlet Gates |
None |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
28 |
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-121