West Fork Big Creek Dam L- 66 Reservoir Report
Last Updated: January 11, 2026
West Fork Big Creek Dam L-66, located in Harrison, Missouri, was completed in 2008 by the USDA NRCS and serves as a key structure for flood risk reduction along TR-Little Creek.
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Summary
This private-owned earth dam stands at a height of 32.2 feet and has a storage capacity of 115.3 acre-feet, with a normal storage of 29 acre-feet. The dam spans 430 feet in length and covers a drainage area of 340 acres, with a maximum discharge capacity of 310 cubic feet per second.
Despite being a low hazard potential structure, West Fork Big Creek Dam L-66 is classified as having a moderate risk level. The dam features an uncontrolled spillway with a width of 40 feet and does not have outlet gates. While its condition is currently not rated and it has not undergone regular inspections, the dam's risk management measures are not specified. With its strategic location and purposeful design, this dam exemplifies the importance of sustainable water resource management and climate resilience efforts in the region, under the jurisdiction of the Rock Island District.
For water resource and climate enthusiasts, West Fork Big Creek Dam L-66 presents an intriguing case study of a privately-owned flood risk reduction structure in Missouri. With its unique design by the USDA NRCS, this earth dam showcases the collaborative efforts between private owners and government agencies to address the challenges of water management and climate adaptation. As a key component of the local watershed system, this dam plays a crucial role in mitigating flood risks and safeguarding the surrounding communities and ecosystems from potential water-related disasters.
Year Completed |
2008 |
Dam Length |
430 |
Dam Height |
32.2 |
River Or Stream |
TR-LITTLE CREEK |
Primary Dam Type |
Earth |
Surface Area |
8 |
Hydraulic Height |
32 |
Drainage Area |
340 |
Nid Storage |
115.3 |
Structural Height |
36 |
Outlet Gates |
None |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
36 |
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- 66