East Fork Big Creek Dam Z- 8 Reservoir Report
Last Updated: December 11, 2025
East Fork Big Creek Dam Z-8, located in Harrison, Missouri, was completed in 2010 with a primary purpose of flood risk reduction.
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Summary
Designed by the USDA NRCS, this earth dam stands at a height of 24.1 feet and has a maximum storage capacity of 69.4 acre-feet. Situated on Zadie Creek, the dam serves to protect the surrounding area from potential flooding events, with a low hazard potential and a moderate risk assessment rating.
Owned privately, East Fork Big Creek Dam Z-8 is not regulated or inspected by the state of Missouri. The dam features an uncontrolled spillway with a width of 30 feet, and no outlet gates. Its structural height reaches 28 feet, with a length of 580 feet and a drainage area of 25.6 square miles. While the condition of the dam is currently not rated, it has not undergone any modifications since its completion, indicating a stable and reliable structure for flood risk management in the region.
Although East Fork Big Creek Dam Z-8 has not been assessed for its emergency action plan (EAP) preparedness or compliance with guidelines, its risk management measures are considered moderate. With no associated locks, the dam operates solely for flood risk reduction, demonstrating its critical role in protecting the local community from potential inundation events. As a part of the Rock Island District, this dam represents a vital infrastructure project in the region, serving as a testament to effective collaboration between private owners and federal agencies for water resource management in Missouri.
Year Completed |
2010 |
Dam Length |
580 |
Dam Height |
24.1 |
River Or Stream |
ZADIE CREEK |
Primary Dam Type |
Earth |
Surface Area |
2 |
Hydraulic Height |
24 |
Drainage Area |
25.6 |
Nid Storage |
69.4 |
Structural Height |
28 |
Outlet Gates |
None |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
28 |
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- 8