East Fork Big Creek Dam E-100b Reservoir Report
Last Updated: December 16, 2025
East Fork Big Creek Dam E-100b, located in Bethany, Missouri, was completed in 1985 by the USDA NRCS for the primary purpose of flood risk reduction along the East Fork Big Creek.
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Summary
This earth dam stands at a height of 26 feet, with a total structural height of 29 feet and a length of 380 feet. It has a storage capacity of 29.1 acre-feet, with a normal storage level of 6.5 acre-feet, and covers a surface area of 2 acres within a drainage area of 12.8 square miles.
The dam features an uncontrolled spillway with a width of 20 feet and other controlled outlet gates. Despite its low hazard potential, the dam is classified as having a moderate risk level. With no state regulation, inspection, or enforcement measures in place, the condition assessment of the dam is currently not rated. The risk management measures and emergency action plan for the dam are not fully documented, indicating a need for further assessment and preparedness in case of emergencies.
Overall, East Fork Big Creek Dam E-100b serves as an essential infrastructure for flood risk reduction in the area, providing protection to the surrounding communities. However, there is a need for improved risk assessment and management strategies to ensure the safety and resilience of the dam in the face of potential climate challenges and water resource management issues in the future.
Year Completed |
1985 |
Dam Length |
380 |
Dam Height |
26 |
River Or Stream |
EAST FORK BIG CREEK |
Primary Dam Type |
Earth |
Surface Area |
2 |
Hydraulic Height |
26 |
Drainage Area |
12.8 |
Nid Storage |
29.1 |
Structural Height |
29 |
Outlet Gates |
Other Controlled |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
29 |
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 Big Creek Dam E-100b