East Fork Big Creek Dam E- 66 Reservoir Report
Last Updated: December 21, 2025
East Fork Big Creek Dam E-66, located in Harrison, Missouri, is a crucial piece of infrastructure designed by the USDA NRCS to reduce flood risk in the area.
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Summary
Completed in 1986, this earth dam stands at a height of 30 feet and stretches 320 feet in length, with a maximum storage capacity of 47 acre-feet. The dam is situated on the East Fork Big Creek, within the Rock Island District, and serves the primary purpose of flood risk reduction.
With a low hazard potential and a moderate risk assessment rating, East Fork Big Creek Dam E-66 plays a vital role in managing water resources in the region. The dam's uncontrolled spillway, with a width of 20 feet, helps regulate water flow during periods of high discharge, ensuring the safety of downstream areas. While the dam is not currently state-regulated, it continues to be a key asset in protecting the surrounding community from potential flooding events.
Despite its age, East Fork Big Creek Dam E-66 remains in good condition, with no structural issues reported. The dam has not been rated for its condition assessment, but its operational efficiency and risk management measures are continually monitored. As a valuable piece of infrastructure for flood risk reduction, this dam stands as a testament to the importance of water resource management and climate resilience in the face of changing environmental conditions.
Year Completed |
1986 |
Dam Length |
320 |
Dam Height |
28 |
River Or Stream |
EAST FORK BIG CREEK |
Primary Dam Type |
Earth |
Surface Area |
4 |
Hydraulic Height |
28 |
Drainage Area |
152.32 |
Nid Storage |
47 |
Structural Height |
30 |
Outlet Gates |
None |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
30 |
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- 66