East Fork Big Cr Watershed Site Z-4 Reservoir Report
Last Updated: December 11, 2025
East Fork Big Cr Watershed Site Z-4 is a key structure managed by the USDA NRCS in Iowa, designed to serve multiple purposes including fire protection, stock, small fish pond, and flood risk reduction.
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Summary
Completed in 1995, this earth dam stands at a height of 20 feet and spans 500 feet, with a storage capacity of 100 acre-feet and a drainage area of 0.34 square miles. Located in Decatur County, Iowa, this site plays a crucial role in managing water resources and mitigating flood risks in the region.
The dam at East Fork Big Cr Watershed Site Z-4 is state-regulated by the Iowa DNR, ensuring that it meets all necessary permitting, inspection, and enforcement requirements. Despite its low hazard potential, the site is considered to have a moderate risk level, emphasizing the importance of proper risk management measures. With its primary focus on water resource management and environmental conservation, this structure serves as a vital asset in safeguarding the local ecosystem and supporting sustainable development practices.
As part of the Rock Island District, East Fork Big Cr Watershed Site Z-4 exemplifies the collaborative efforts between local government agencies, federal entities, and conservation groups to protect water resources and enhance climate resilience in the region. With its strategic location and design, this site stands as a testament to the importance of effective dam infrastructure in ensuring water security, ecological sustainability, and disaster preparedness for the community.
Year Completed |
1995 |
Dam Length |
500 |
Dam Height |
20 |
River Or Stream |
TR- ZADIE CREEK |
Primary Dam Type |
Earth |
Surface Area |
5.3 |
Drainage Area |
0.34 |
Nid Storage |
100 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
20 |
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 Cr Watershed Site Z-4