Little Yellow 30 Reservoir Report
Last Updated: December 13, 2025
Little Yellow 30, located in Juneau, Wisconsin, is a state-regulated dam with a primary purpose of irrigation and also serves for recreation and water supply.
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Summary
Completed in 1935, this gravity dam stands at 8 feet high and has a storage capacity of 130 acre-feet. With a normal storage capacity of 30 acre-feet and a surface area of 25 acres, the dam plays a crucial role in managing water resources in the area.
The dam, situated on Johnson Lateral, is under the jurisdiction of the Wisconsin Department of Natural Resources and undergoes regular inspections, enforcement, and permitting. Despite being rated as having low hazard potential, the dam is considered to have a very high risk due to its condition assessment not being rated. The dam's spillway type is controlled, and it has a maximum discharge capacity of 371 cfs, ensuring effective water management and flood control measures in the region.
Little Yellow 30 is a significant infrastructure contributing to the sustainable use of water resources in Wisconsin. With its multifaceted purposes and regulatory oversight, the dam serves as a vital component in the state's water management strategy. Climate and water resource enthusiasts would find interest in exploring the details and significance of this dam in maintaining the ecological balance and meeting the water demands of the surrounding communities.
Year Completed |
1935 |
Dam Length |
40 |
Dam Height |
8 |
River Or Stream |
JOHNSON LATERAL |
Primary Dam Type |
Gravity |
Surface Area |
25 |
Hydraulic Height |
2 |
Drainage Area |
1.3 |
Nid Storage |
130 |
Structural Height |
8 |
Hazard Potential |
Low |
Nid Height |
8 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Yellow River At Babcock
|
44cfs |
Yellow River At Necedah
|
52cfs |
Tenmile Creek Near Nekoosa
|
27cfs |
Wisconsin River At Wisconsin Rapids
|
1960cfs |
Lemonweir River At New Lisbon
|
261cfs |
Black River At Neillsville
|
193cfs |
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.
Little Yellow 30