Little Yellow 10 Reservoir Report

Last Updated: December 13, 2025

Little Yellow 10 is a gravity dam located in Necedah, Wisconsin, along the East Branch of Little Yellow River.


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Summary

Built in 1936, this Federal-owned structure serves primarily for irrigation purposes, with additional benefits for recreation and water supply. The dam has a height of 7 feet and a storage capacity of 150 acre-feet, providing essential water resources for the surrounding area.

Despite its low hazard potential, Little Yellow 10 is classified with a very high risk assessment rating of 1, indicating the importance of proper risk management measures. With a drainage area of 8.2 square miles and a maximum discharge capacity of 385 cubic feet per second, this dam plays a crucial role in managing water flow and ensuring water availability for irrigation and other purposes in the region. The dam's condition assessment is currently listed as "Not Rated," highlighting the need for ongoing monitoring and maintenance to ensure its continued safety and functionality.

Overall, Little Yellow 10 serves as a vital infrastructure for water resource management in Juneau County, Wisconsin. With its historical significance and important role in irrigation and water supply, this gravity dam stands as a reminder of the critical link between water resources and climate resilience in the region. Ongoing risk assessment and management efforts will be crucial to safeguarding the dam's integrity and ensuring its continued contribution to the local community's water needs.

Year Completed

1936

Dam Length

40

Dam Height

7

River Or Stream

EAST BRANCH LITTLE YELLOW

Primary Dam Type

Gravity

Surface Area

50

Hydraulic Height

6

Drainage Area

8.2

Nid Storage

150

Structural Height

7

Hazard Potential

Low

Nid Height

7
       
Seasonal Comparison

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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.