West Fork Big Creek Dam B- 99 Reservoir Report
Last Updated: December 17, 2025
West Fork Big Creek Dam B- 99, also known as Site B-99, is a local government-owned structure located in Bethany, Missouri.
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Summary
Built in 1992 by the USDA NRCS, this earth dam stands at a height of 31 feet and spans 410 feet in length. Its primary purpose is flood risk reduction, with a storage capacity of 128 acre-feet and a normal storage level of 35 acre-feet. The dam is situated on the TR-West Fork Big Creek, within the Rock Island District.
Despite being classified as having a low hazard potential and not currently rated for condition assessment, West Fork Big Creek Dam B- 99 is considered to pose a moderate risk. It has an uncontrolled spillway with a width of 74 feet and a maximum discharge capacity of 442 cubic feet per second. While it lacks outlet gates, the dam has not undergone any modifications since its completion. With its stone core and soil foundation, this dam plays a crucial role in managing water resources and mitigating flood risks in the Harrison County area.
Year Completed |
1992 |
Dam Length |
410 |
Dam Height |
31 |
River Or Stream |
TR-WEST FORK BIG CREEK |
Primary Dam Type |
Earth |
Surface Area |
4 |
Hydraulic Height |
31 |
Drainage Area |
44 |
Nid Storage |
128 |
Structural Height |
32 |
Outlet Gates |
None |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
32 |
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.
West Fork Big Creek Dam B- 99