East Fork Grand River Watershed Site E58b Reservoir Report
Last Updated: December 13, 2025
Located in Allendale, MO, the East Fork Grand River Watershed Site E58b is a flood risk reduction structure designed by the USDA NRCS and completed in 2010.
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Summary
This earth dam stands at a height of 30 feet and spans 450 feet, with a storage capacity of 54 acre-feet. It serves the primary purpose of flood risk reduction and is regulated by the Iowa DNR.
The dam is situated in Ringgold County, Iowa, with a drainage area of 0.17 square miles and a maximum discharge capacity of 151 cubic feet per second. Despite its low hazard potential, the dam has not been rated for its condition. It features a spillway width of 20 feet and is inspected, permitted, and enforced by the state regulatory agencies. The structure's emergency action plan status, risk assessment, and management measures are currently undisclosed.
With its strategic location and critical role in managing flood risks within the watershed, the East Fork Grand River Watershed Site E58b represents a significant infrastructure investment by the local government. As a key element in the region's water resource management system, this dam underscores the importance of proactive measures in safeguarding communities against potential flooding events. Its operational efficiency and structural integrity contribute to the overall resilience of the surrounding area in the face of changing climate patterns and water dynamics.
Year Completed |
2010 |
Dam Length |
450 |
Dam Height |
30 |
River Or Stream |
Tr to Lotts Creek |
Primary Dam Type |
Earth |
Surface Area |
3 |
Drainage Area |
0.17 |
Nid Storage |
54 |
Outlet Gates |
None |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
30 |
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 E58b