East Fork Big Creek Dam Z- 9 Reservoir Report
Last Updated: December 11, 2025
East Fork Big Creek Dam Z-9 is a vital flood risk reduction structure located in Harrison, Missouri.
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Summary
Built in 1988 by the USDA NRCS, this earth dam stands at a height of 24 feet and spans 480 feet in length, with a storage capacity of 51.2 acre-feet and a surface area of 3 acres. The dam is designed to control the flow of the Zadie River and protect the surrounding area from potential flooding events.
Despite being categorized as having a low hazard potential, the dam is considered to have a moderate risk level, with a rating of 3. While the condition assessment is currently not rated, the dam is equipped with other controlled outlet gates and an uncontrolled spillway with a width of 20 feet. The dam's primary purpose is flood risk reduction, serving as a crucial infrastructure for the local government in Bethany to safeguard against potential disasters.
Managed by the Rock Island District of the USACE, East Fork Big Creek Dam Z-9 plays a key role in the region's water resource management. With its strategic location and design, the dam serves as a testament to the collaborative efforts between federal and local agencies in ensuring the safety and sustainability of water resources in Missouri.
Year Completed |
1988 |
Dam Length |
480 |
Dam Height |
24 |
River Or Stream |
ZADIE |
Primary Dam Type |
Earth |
Surface Area |
3 |
Hydraulic Height |
24 |
Drainage Area |
57.6 |
Nid Storage |
51.2 |
Structural Height |
27 |
Outlet Gates |
Other Controlled |
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 Z- 9