Dandy Creek 11 Reservoir Report

Last Updated: December 13, 2025

Located in Monroe, Wisconsin, Dandy Creek 11 is a gravity dam on the Lemonweir River primarily used for irrigation purposes.


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Summary

Built in 1935, this dam stands at a height of 10 feet and has a storage capacity of 50 acre-feet. With a normal storage capacity of 20 acre-feet and a maximum discharge of 2500 cubic feet per second, Dandy Creek 11 plays a crucial role in water management within the region.

Despite its age, Dandy Creek 11 is in fair condition with a low hazard potential, making it a relatively safe structure. The dam's controlled spillway and inspection frequency of 10 years contribute to its overall safety and effectiveness in water resource management. With state regulation and enforcement in place, the dam ensures the sustainable use of water for irrigation, recreation, and water supply while minimizing risks to nearby communities.

As a key feature in the St. Paul District, Dandy Creek 11 serves as a vital infrastructure for water resource management in the area. With its strategic location and design, the dam continues to play a significant role in supporting agricultural activities and ensuring water availability for various purposes. Climate and water resource enthusiasts can appreciate the importance of Dandy Creek 11 in maintaining a balance between water supply, irrigation needs, and environmental sustainability in the region.

Year Completed

1935

Dam Length

82

Dam Height

10

River Or Stream

LEMONWEIR

Primary Dam Type

Gravity

Surface Area

7

Hydraulic Height

4

Drainage Area

136

Nid Storage

50

Structural Height

10

Hazard Potential

Low

Nid Height

10
       
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.