East Fork Big Creek Dam E- 55 Reservoir Report
Last Updated: December 12, 2025
East Fork Big Creek Dam E-55, located in Harrison, Missouri, serves as a vital flood risk reduction structure along the East Fork Big Creek.
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Summary
Built in 1987 by the USDA NRCS, this earth dam stands at a height of 29 feet and stretches 365 feet in length, with a storage capacity of 59 acre-feet. Despite its low hazard potential, the dam plays a crucial role in protecting the surrounding area from potential flood events, with a maximum discharge capacity of 40 cubic feet per second.
The dam's primary purpose remains focused on flood risk reduction, with the spillway designed as uncontrolled and a hydraulic height matching the dam height at 29 feet. Although currently not regulated by the state, the East Fork Big Creek Dam E-55 continues to be a key structure in managing water resources in the region, with a moderate risk assessment rating. As water resource and climate enthusiasts, the technical specifications and strategic location of this dam offer valuable insights into the ongoing efforts to mitigate flood risks and protect communities in Missouri.
Year Completed |
1987 |
Dam Length |
365 |
Dam Height |
29 |
River Or Stream |
EAST FORK BIG CREEK |
Primary Dam Type |
Earth |
Surface Area |
6 |
Hydraulic Height |
29 |
Drainage Area |
194.56 |
Nid Storage |
59 |
Structural Height |
31 |
Outlet Gates |
None |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
31 |
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- 55