East Fork Big Creek Dam E- 74 Reservoir Report
Last Updated: December 17, 2025
East Fork Big Creek Dam E-74, also known as Simpson Site E-74 Dam, is a local government-owned structure located in Harrison, Missouri.
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Summary
Built in 1984 by the USDA NRCS, this earth-type dam stands at a height of 26 feet and spans a length of 530 feet along the East Fork Big Creek. With a primary purpose of flood risk reduction, the dam has a storage capacity of 91 acre-feet and serves to protect the surrounding area from potential flooding events.
Despite being categorized as having a low hazard potential, East Fork Big Creek Dam E-74 is considered to have a moderate risk level. It has a spillway width of 40 feet and a maximum discharge capacity of 80 cubic feet per second. The dam has not been inspected or rated for condition assessment, and there is no Emergency Action Plan (EAP) in place. However, the risk management measures for this dam are currently unspecified, indicating a need for further evaluation and planning to ensure its continued safety and effectiveness in flood risk reduction.
Located within the Rock Island District, East Fork Big Creek Dam E-74 plays a crucial role in managing water resources and mitigating flood risks in the area. As a key infrastructure built to protect the community from potential flooding events, it highlights the importance of ongoing monitoring, assessment, and maintenance to ensure its long-term functionality and safety for both residents and the environment.
Year Completed |
1984 |
Dam Length |
530 |
Dam Height |
26 |
River Or Stream |
EAST FORK BIG CREEK |
Primary Dam Type |
Earth |
Surface Area |
9 |
Hydraulic Height |
26 |
Drainage Area |
284.8 |
Nid Storage |
91 |
Structural Height |
28 |
Outlet Gates |
None |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
28 |
Seasonal Comparison
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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- 74