East Fork Big Creek Dam E- 99 Reservoir Report
Last Updated: December 16, 2025
East Fork Big Creek Dam E- 99, also known as Site E-99, is a crucial flood risk reduction structure located in Harrison, Missouri.
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Summary
Built in 1985 by the USDA NRCS, this earth dam stands at a height of 31.7 feet and has a hydraulic height of 32 feet, serving the primary purpose of flood risk reduction along the TR-East Fork Big Creek. With a storage capacity of 71 acre-feet and a maximum discharge of 100 cubic feet per second, this dam plays a key role in managing water flow and protecting the surrounding areas from flooding.
Managed by the Natural Resources Conservation Service, East Fork Big Creek Dam E- 99 has a low hazard potential and is currently rated as "Not Rated" in terms of condition assessment. Despite not being state-regulated or inspected, this dam meets the moderate risk assessment of 3, indicating the importance of ongoing monitoring and maintenance. With a spillway width of 50 feet and no outlet gates, this structure is designed to handle uncontrolled overflow and ensure the safety of downstream areas. While not federally owned, East Fork Big Creek Dam E- 99 stands as a testament to effective local government collaboration in water resource management and climate resilience efforts in Missouri.
Year Completed |
1985 |
Dam Length |
380 |
Dam Height |
31.7 |
River Or Stream |
TR-EAST FORK BIG CREEK |
Primary Dam Type |
Earth |
Surface Area |
3 |
Hydraulic Height |
32 |
Drainage Area |
0.26 |
Nid Storage |
71 |
Structural Height |
32 |
Outlet Gates |
None |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
32 |
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.
East Fork Big Creek Dam E- 99