West Fork Big Creek Dam L- 58 Reservoir Report
Last Updated: December 17, 2025
West Fork Big Creek Dam L-58, also known as Site L-58, is a local government-owned earth dam located in Harrison County, Missouri.
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Summary
Built in 2005 by the USDA NRCS, this dam serves the primary purpose of flood risk reduction along the West Fork Big Creek. With a height of 31 feet and a length of 400 feet, the dam has a storage capacity of 94.2 acre-feet, with a normal storage level of 24.1 acre-feet.
This uncontrolled spillway dam has a low hazard potential and is currently in a not rated condition assessment. The dam's risk assessment has been categorized as moderate (3). Despite not having outlet gates, the dam has a maximum discharge capacity of 297 cubic feet per second. The surrounding area has a surface area of 7 acres and a drainage area of 26 square miles, making it crucial for flood risk management in the region.
With its strategic location and capacity to mitigate flood risks, West Fork Big Creek Dam L-58 plays a vital role in protecting the surrounding area from potential inundation. As a key infrastructure project in the Rock Island District, this dam stands as a testament to effective water resource management and climate adaptation efforts in Missouri.
Year Completed |
2005 |
Dam Length |
400 |
Dam Height |
31 |
River Or Stream |
WEST FORK BIG CREEK |
Primary Dam Type |
Earth |
Surface Area |
7 |
Hydraulic Height |
31 |
Drainage Area |
26 |
Nid Storage |
94.2 |
Structural Height |
38 |
Outlet Gates |
None |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
38 |
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 L- 58