East Fork Grand River Watershed Site D-48 Reservoir Report
Last Updated: December 13, 2025
Located in Ringgold County, Iowa, the East Fork Grand River Watershed Site D-48 is a flood risk reduction structure designed by the USDA NRCS and completed in 2011.
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Summary
This earth dam stands at a height of 23 feet and spans a length of 760 feet, with a storage capacity of 173 acre-feet. The primary purpose of this dam is to mitigate flooding in the area, with a low hazard potential and a condition assessment that is currently not rated.
Managed by the Iowa DNR, this dam is state-regulated and permitted, with regular inspections and enforcement in place to ensure its functionality and safety. The structure is situated near the Tr to Lotts Creek, within the Rock Island District, and falls under the jurisdiction of the State of Iowa. While the dam has not been modified in recent years and lacks certain emergency preparedness measures like an EAP, it serves as a crucial component of the local water resource management system in this region.
Overall, the East Fork Grand River Watershed Site D-48 plays a vital role in reducing flood risk and protecting the surrounding community from potential water-related disasters. With its strategic location, solid construction, and state oversight, this dam is a key asset in safeguarding the environment and ensuring sustainable water resource management in Ringgold County, Iowa.
Year Completed |
2011 |
Dam Length |
760 |
Dam Height |
23 |
River Or Stream |
Tr to Lotts Creek |
Primary Dam Type |
Earth |
Surface Area |
12 |
Drainage Area |
0.57 |
Nid Storage |
173 |
Outlet Gates |
None |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
23 |
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 D-48