West Fork Big Creek Dam B- 70 Reservoir Report
Last Updated: December 12, 2025
West Fork Big Creek Dam B-70, also known as Site B-70, is a local government-owned structure in Harrison, Missouri, designed by the USDA NRCS to primarily serve flood risk reduction purposes.
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Summary
Completed in 2005, this earth dam stands at a height of 26 feet with a hydraulic and structural height of 45 feet. It has a dam length of 600 feet and a storage capacity of 64.6 acre-feet, providing protection to a drainage area of 120 square miles.
Located on the West Fork Big Creek, this dam features an uncontrolled spillway with a width of 20 feet and a surface area of 11 acres. Despite being classified as low hazard potential and not currently rated for condition assessment, the dam poses a moderate risk level. With a maximum discharge capacity of 139.1 cubic feet per second, it plays a crucial role in managing water flow in the area. While there are no outlet gates or associated structures, this dam serves as a vital infrastructure for mitigating flood risks in the region.
In the event of emergencies, the dam's emergency action plan (EAP) status and risk management measures remain unspecified. With a risk assessment rating of moderate, it is important for water resource and climate enthusiasts to monitor the condition and maintenance of West Fork Big Creek Dam B-70 to ensure its continued effectiveness in flood risk reduction and water management efforts.
Year Completed |
2005 |
Dam Length |
600 |
Dam Height |
26 |
River Or Stream |
WEST FORK BIG CREEK |
Primary Dam Type |
Earth |
Surface Area |
11 |
Hydraulic Height |
26 |
Drainage Area |
120 |
Nid Storage |
64.6 |
Structural Height |
45 |
Outlet Gates |
None |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
45 |
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- 70