East Fork Big Creek Dam E-100a Reservoir Report
Last Updated: December 16, 2025
East Fork Big Creek Dam E-100a, located in Bethany, Missouri, is a flood risk reduction structure designed by the USDA NRCS and completed in 1985.
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Summary
This earth dam stands at a height of 27 feet and spans 460 feet in length, providing vital protection for the surrounding area along the East Fork Big Creek. With a normal storage capacity of 16 acre-feet and a maximum storage of 65 acre-feet, this dam plays a crucial role in managing water flow and reducing flood risks in the region.
Although East Fork Big Creek Dam E-100a has a low hazard potential and is currently rated as "Not Rated" in terms of condition assessment, it is considered to have a moderate risk level. Despite this, the dam does not have a state regulatory agency overseeing its operations, inspections, or enforcement. With an uncontrolled spillway width of 24 feet and no outlet gates, this structure operates under the management of the Natural Resources Conservation Service, serving as a key component in the flood risk reduction efforts in Harrison County, Missouri.
As water resource and climate enthusiasts, the data on East Fork Big Creek Dam E-100a highlights the importance of maintaining and monitoring infrastructure to safeguard communities from potential flooding events. With its strategic location and design specifications, this dam stands as a testament to the collaborative efforts of local government and federal agencies in protecting the region's water resources and enhancing resilience in the face of changing climate patterns.
Year Completed |
1985 |
Dam Length |
460 |
Dam Height |
27 |
River Or Stream |
EAST FORK BIG CREEK |
Primary Dam Type |
Earth |
Surface Area |
3 |
Hydraulic Height |
27 |
Drainage Area |
32 |
Nid Storage |
65 |
Structural Height |
29 |
Outlet Gates |
None |
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-100a