West Fork Big Creek Dam B- 89 Reservoir Report
Last Updated: December 16, 2025
West Fork Big Creek Dam B-89, located in Harrison, Missouri, was designed by the USDA NRCS and completed in 2007 for the primary purpose of flood risk reduction along the West Fork Big Creek.
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Summary
This private dam is classified as an earth dam with a structural height of 34 feet and a hydraulic height of 21.5 feet. It has a storage capacity of 79.8 acre-feet, with a normal storage level of 19.2 feet and a drainage area of 198.4 square miles.
With a low hazard potential and a moderate risk assessment rating, West Fork Big Creek Dam B-89 serves as a vital infrastructure for managing flood risks in the area. The dam features an uncontrolled spillway with a width of 30 feet, and although it is not state-regulated, it plays a crucial role in protecting the surrounding community from potential flooding events. Despite its condition being labeled as "Not Rated," the dam's design and construction by the Natural Resources Conservation Service ensure its reliability in safeguarding the region against water-related disasters.
As part of the Rock Island District, this dam aligns with the flood risk reduction efforts in the area, contributing to the overall water resource management strategy. Its strategic location and design, along with its operational capabilities, demonstrate a commitment to ensuring the safety and well-being of the residents of Eagleville and the broader Harrison County. West Fork Big Creek Dam B-89 stands as a testament to the importance of proactive measures in climate resilience and water resource protection.
Year Completed |
2007 |
Dam Length |
400 |
Dam Height |
21.5 |
River Or Stream |
TR-WEST FORK BIG CREEK |
Primary Dam Type |
Earth |
Surface Area |
18 |
Hydraulic Height |
21.5 |
Drainage Area |
198.4 |
Nid Storage |
79.8 |
Structural Height |
34 |
Outlet Gates |
None |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
34 |
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- 89