Jett Subwatershed Site 2-1 Reservoir Report
Last Updated: December 13, 2025
Jett Subwatershed Site 2-1 is a crucial flood risk reduction infrastructure located in Woodbury, Iowa, along the TR- EAST BRANCH river.
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Summary
This earth dam, constructed in 2002 by the USDA NRCS, stands at a height of 33 feet and spans 386 feet in length. With a storage capacity of 42 acre-feet and a surface area of 2.5 acres, this dam plays a pivotal role in managing water flow and mitigating flood hazards in the region.
Managed by the Iowa DNR, Jett Subwatershed Site 2-1 is designed to withstand moderate risks and has a low hazard potential. While not currently rated for condition assessment, this site meets state regulations for permitting, inspection, and enforcement. The dam's spillway is uncontrolled, with a width of 2 feet, and it serves as a critical element for ensuring the safety and integrity of the structure during high water events.
This site, owned by the local government and primarily funded by the Natural Resources Conservation Service, exemplifies collaborative efforts to protect the surrounding community from flooding. With its strategic location and design features, Jett Subwatershed Site 2-1 stands as a testament to effective water resource management and climate resilience in Iowa.
Year Completed |
2002 |
Dam Length |
386 |
Dam Height |
33 |
River Or Stream |
TR- EAST BRANCH |
Primary Dam Type |
Earth |
Surface Area |
2.5 |
Drainage Area |
0.19 |
Nid Storage |
42 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
33 |
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 2-1