Jett Subwatershed Site M-6 Reservoir Report

Last Updated: December 13, 2025

Located in Woodbury, Iowa, the Jett Subwatershed Site M-6 is a local government-owned dam constructed in 2003 by the USDA NRCS.


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Summary

Situated on the TR- East Branch Wolf Creek, this earth dam stands at a height of 32 feet and spans 510 feet in length, with a storage capacity of 279 acre-feet and a surface area of 12.6 acres. Despite its low hazard potential and moderate risk assessment rating, the dam is currently not rated in terms of condition assessment.

Managed by the Iowa DNR, this dam is regulated, permitted, inspected, and enforced by the state, highlighting a commitment to water resource and climate protection in the region. With a primary purpose not specified, the Jett Subwatershed Site M-6 serves as a crucial infrastructure for water management in the area, ensuring the safety and efficiency of water flow and storage. As a significant component in the local watershed system, this dam plays a vital role in maintaining ecological balance and water security for the community of Little Sioux and surrounding areas.

Year Completed

2003

Dam Length

510

Dam Height

32

River Or Stream

TR- EAST BRANCH WOLF CREEK

Primary Dam Type

Earth

Surface Area

12.6

Drainage Area

2.47

Nid Storage

279

Hazard Potential

Low

Foundations

Soil

Nid Height

32
       
Seasonal Comparison

Weather Forecast

Dam Data Reference

Condition Assessment

Satisfactory
No 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

High
Dams 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.