East Fork Grand River Watershed Site D-40 Reservoir Report
Last Updated: December 14, 2025
East Fork Grand River Watershed Site D-40 in Iowa is a crucial flood risk reduction infrastructure managed by the local government with oversight from the Iowa Department of Natural Resources.
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Summary
This earth dam, completed in 2008, stands at 24 feet tall and stretches 620 feet in length, providing storage for up to 95 acre-feet of water. Located in Ringgold County, this site plays a vital role in protecting the surrounding area from potential flooding events.
The dam's primary purpose of flood risk reduction is evident in its design and function, with a spillway width of 1 foot and a hazard potential rated as low. Despite not being rated for condition assessment, the site's risk assessment is moderate, highlighting the importance of ongoing monitoring and maintenance. With a drainage area of 0.29 square miles and a maximum storage capacity of 95 acre-feet, East Fork Grand River Watershed Site D-40 serves as a critical piece of infrastructure for water resource management in the region.
Managed by the USDA NRCS, this site on a tributary to Lotts Creek showcases the collaborative effort between local and federal agencies to safeguard communities from potential flood events. With its strategic location and capacity for floodwater storage, East Fork Grand River Watershed Site D-40 stands as a testament to the importance of proactive water resource and climate management in mitigating risks and ensuring the resilience of our environment.
Year Completed |
2008 |
Dam Length |
620 |
Dam Height |
24 |
River Or Stream |
Trib to Lotts Creek |
Primary Dam Type |
Earth |
Surface Area |
6 |
Drainage Area |
0.29 |
Nid Storage |
95 |
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 D-40