West Fork Big Creek Dam B- 90 Reservoir Report

Last Updated: April 27, 2026

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West Fork Big Creek Dam B-90, located in Harrison, Missouri, was completed in 2007 with a primary purpose of flood risk reduction.


Summary

The dam, designed by USDA NRCS, is an earth dam with a structural height of 32 feet and a hydraulic height of 25 feet. It has a normal storage capacity of 19.6 acre-feet and a maximum storage capacity of 81.6 acre-feet, serving the West Fork Big Creek watershed with a drainage area of 115 square miles.

Despite its low hazard potential, West Fork Big Creek Dam B-90 poses a moderate risk, according to a risk assessment rating of 3. The dam features an uncontrolled spillway with a width of 30 feet and no outlet gates. It is owned and operated by a private entity, with no state regulation or inspection in place. While the dam is not currently rated for its condition, it stands as a vital infrastructure for mitigating flood risks in the region.

With a captivating design by the Natural Resources Conservation Service and its strategic location in the Rock Island District, West Fork Big Creek Dam B-90 stands as a crucial asset for managing water resources in the area. Despite its limited oversight and maintenance history, the dam plays a significant role in protecting the local community from potential flooding events, showcasing the importance of proactive infrastructure development in the face of changing climate patterns.

15-Day Long Term Forecast


Year Completed

2007

Dam Length

485

Dam Height

25.3

River Or Stream

TR-WEST FORK BIG CREEK

Primary Dam Type

Earth

Surface Area

25

Hydraulic Height

25

Drainage Area

115

Nid Storage

81.6

Structural Height

32

Outlet Gates

None

Hazard Potential

Low

Foundations

Soil

Nid Height

32
       
Seasonal Comparison

5-Day Hourly Forecast Detail

Dam Data Reference

Condition Assessment

Satisfactory
No 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

High
Dams 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.
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