East Fork Big Cr Watershed Site Z-5-1 Reservoir Report
Last Updated: December 11, 2025
Located in Decatur County, Iowa, the East Fork Big Cr Watershed Site Z-5-1 is a local government-owned dam designed by the USDA NRCS for fire protection, stock, or a small fish pond.
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Summary
Completed in 1995, this earth dam stands at 27 feet tall and spans 520 feet in length, providing a storage capacity of 110 acre-feet and covering a surface area of 5.6 acres. The dam serves multiple purposes, including flood risk reduction, and is regulated by the Iowa DNR with state permitting, inspection, and enforcement in place.
With a low hazard potential and a moderate risk assessment rating, this dam on TR-Zadie Creek is crucial for water resource management in the region. Although not currently rated for condition assessment, the East Fork Big Cr Watershed Site Z-5-1 plays a significant role in mitigating flood risks and providing water storage for various needs. As a part of the Rock Island District, this dam stands as a testament to collaborative efforts between federal and state agencies to ensure the safety and sustainability of water resources in the area.
Year Completed |
1995 |
Dam Length |
520 |
Dam Height |
27 |
River Or Stream |
TR- ZADIE CREEK |
Primary Dam Type |
Earth |
Surface Area |
5.6 |
Drainage Area |
0.36 |
Nid Storage |
110 |
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 Cr Watershed Site Z-5-1