Little Yellow 11 Reservoir Report

Last Updated: December 13, 2025

Little Yellow 11, also known as Structure 29, is a gravity dam located in Juneau, Wisconsin, along the Spencer Robinson Ditch.


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Summary

Completed in 1975, this Federal-owned dam serves primarily for irrigation purposes, with additional functions including recreation and water supply. Standing at a height of 15 feet and a length of 72 feet, Little Yellow 11 has a storage capacity of 1200 acre-feet and a drainage area of 8 square miles.

Despite being classified as having a low hazard potential, Little Yellow 11 is rated as having a very high risk due to its condition assessment being unrated. The dam has not been inspected recently, with an inspection frequency of 10 years. Emergency action plans and risk assessment are lacking, indicating a need for improved safety measures and management. The dam's location in a high-risk area underscores the importance of proactive measures to mitigate potential risks and ensure the safety of surrounding communities.

As an integral part of the water infrastructure in Wisconsin, Little Yellow 11 plays a crucial role in irrigation and water supply in the region. With its controlled spillway and moderate storage capacity, the dam serves as a key resource for managing water levels and supporting agricultural activities. However, the lack of recent inspections and emergency preparedness highlights the need for increased attention to safety protocols and risk management to safeguard the dam and surrounding areas from potential hazards.

Year Completed

1975

Dam Length

72

Dam Height

15

River Or Stream

SPENCER ROBINSON DITCH

Primary Dam Type

Gravity

Surface Area

200

Hydraulic Height

9

Drainage Area

8

Nid Storage

1200

Structural Height

15

Hazard Potential

Low

Nid Height

15
       
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.