Jett Subwatershed Site M-5 Reservoir Report
Last Updated: December 13, 2025
Jett Subwatershed Site M-5 is a local government-owned water resource infrastructure located in Woodbury County, Iowa.
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Summary
This site, managed by the USDA NRCS, serves multiple purposes including fire protection, stock watering, and flood risk reduction. The earth dam, completed in 1966, stands at 43 feet high and spans 791 feet in length, providing a storage capacity of 195 acre-feet and covering an area of 8.1 acres.
Despite its low hazard potential, Jett Subwatershed Site M-5 is regulated by the Iowa DNR and undergoes state permitting, inspection, and enforcement to ensure its structural integrity and operational safety. The site's risk assessment is rated as moderate, and it has not been formally rated for its condition assessment. While there is no Emergency Action Plan (EAP) currently in place, the site meets guidelines for risk management measures and has not experienced any major modifications or incidents since its completion.
Situated along the TR-Wolf Creek, Jett Subwatershed Site M-5 plays a critical role in managing water resources in the region. With its focus on fire protection, livestock watering, and flood risk reduction, this site exemplifies the importance of sustainable water infrastructure for both environmental and community resilience in Iowa.
Year Completed |
1966 |
Dam Length |
791 |
Dam Height |
43 |
River Or Stream |
TR-WOLF CREEK |
Primary Dam Type |
Earth |
Surface Area |
8.1 |
Drainage Area |
1.96 |
Nid Storage |
195 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
43 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
West Fork Ditch At Hornick
|
80cfs |
Little Sioux River At Correctionville
|
327cfs |
Maple River At Mapleton
|
323cfs |
Floyd River At James
|
187cfs |
Missouri River At Sioux City
|
15100cfs |
Omaha Cr At Homer
|
45cfs |
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.
Jett Subwatershed Site M-5