East Fork Big Creek Dam A- 33 Reservoir Report
Last Updated: December 13, 2025
East Fork Big Creek Dam A-33, located in Harrison, Missouri, was completed in 1962 and is owned by the local government.
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Summary
Designed by the USDA NRCS, this earth dam stands at a height of 19 feet and has a structural height of 21 feet, serving primarily for flood risk reduction along the East Fork Big Creek. With a maximum storage capacity of 52.5 acre-feet and a normal storage of 21.3 acre-feet, the dam covers a surface area of 4.3 acres and has a drainage area of 230.4 square miles.
The dam features an uncontrolled spillway type with a width of 40 feet and outlet gates for controlled water release. Despite its low hazard potential, the dam's risk assessment is moderate, highlighting the importance of regular inspections and maintenance. With a condition assessment of "Not Rated," the dam's emergency action plan readiness and risk management measures require further evaluation to ensure the safety of surrounding communities in case of potential emergencies. Overall, East Fork Big Creek Dam A-33 plays a crucial role in mitigating flood risks and protecting the local area from water-related disasters.
Year Completed |
1962 |
Dam Length |
365 |
Dam Height |
19 |
River Or Stream |
EAST FORK BIG CREEK |
Primary Dam Type |
Earth |
Surface Area |
4.3 |
Hydraulic Height |
19 |
Drainage Area |
230.4 |
Nid Storage |
52.5 |
Structural Height |
21 |
Outlet Gates |
Other Controlled |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
21 |
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 A- 33