East Fork Big Creek Dam E- 77 Reservoir Report
Last Updated: December 17, 2025
East Fork Big Creek Dam E-77, located in Harrison, Missouri, was completed in 1988 by the USDA NRCS for the primary purpose of flood risk reduction along the East Fork Big Creek.
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Summary
This earth dam stands at a height of 25 feet and has a structural height of 27 feet, with a length of 410 feet. With a storage capacity of 102 acre-feet and a drainage area of 115.2 square miles, the dam plays a crucial role in mitigating flood risks in the region.
Despite being classified as having a low hazard potential and a moderate risk assessment, East Fork Big Creek Dam E-77 has not been rated for its condition. The dam features an uncontrolled spillway with a width of 30 feet and no outlet gates. The surrounding area encompasses a surface area of 4 acres, providing vital flood protection for the local community. Overall, East Fork Big Creek Dam E-77 serves as a key infrastructure asset in ensuring the safety and resilience of the region against potential flooding events.
As a part of the Rock Island District, this dam is not under state regulatory jurisdiction and does not require state permitting, inspection, or enforcement. While it has not been assessed for its emergency action plan or inundation maps, East Fork Big Creek Dam E-77 remains a critical component in the flood risk reduction efforts in the area. With its strategic location and design features, this dam continues to play a significant role in protecting the surrounding community from the impacts of flooding.
Year Completed |
1988 |
Dam Length |
410 |
Dam Height |
25 |
River Or Stream |
EAST FORK BIG CREEK |
Primary Dam Type |
Earth |
Surface Area |
4 |
Hydraulic Height |
25 |
Drainage Area |
115.2 |
Nid Storage |
102 |
Structural Height |
27 |
Outlet Gates |
None |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
27 |
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- 77