West Fork Big Creek Dam P- 18 Reservoir Report
Last Updated: December 15, 2025
West Fork Big Creek Dam P- 18, located in Harrison, Missouri, was completed in 2001 by the USDA NRCS with the primary purpose of flood risk reduction along the Polecat-OS river or stream.
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Summary
This earth dam stands at a height of 30 feet with a hydraulic height of 30 feet and a structural height of 33 feet. It spans 570 feet in length and has a storage capacity of 113 acre-feet, providing a vital resource for the surrounding area.
Despite being categorized as having a low hazard potential, the dam's risk assessment is moderate (3), indicating a level of caution for potential future events. The dam's condition assessment is currently not rated, and there is no designated emergency action plan in place. The dam features uncontrolled spillways and outlet gates, serving as a crucial flood protection measure for the region. With a drainage area of 408 square miles, the dam plays a significant role in managing water resources and mitigating flood risks in the area.
Overall, West Fork Big Creek Dam P- 18 is a key infrastructure project designed to protect the local community from flooding events. With its strategic location and design, the dam serves as a critical asset for water resource and climate enthusiasts in the area. As efforts continue to monitor and assess its condition and risk factors, the dam remains an essential component in safeguarding the region's water supply and infrastructure against potential threats.
Year Completed |
2001 |
Dam Length |
570 |
Dam Height |
30 |
River Or Stream |
POLECAT-OS |
Primary Dam Type |
Earth |
Surface Area |
10 |
Hydraulic Height |
30 |
Drainage Area |
408 |
Nid Storage |
113 |
Structural Height |
33 |
Outlet Gates |
Uncontrolled |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
33 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
East Fork Big Creek Near Bethany
|
4cfs |
Thompson River At Trenton
|
140cfs |
Grand River Near Gallatin
|
50cfs |
Thompson River At Davis City
|
22cfs |
Medicine Creek Near Laredo
|
5cfs |
Grand River At Chillicothe
|
361cfs |
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 P- 18