Rock Creek Flowage Dam Reservoir Report

Last Updated: December 15, 2025

Rock Creek Flowage Dam, located in Clark County, Wisconsin, was completed in 1969 and is primarily used for recreation purposes.


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Summary

Managed by a private owner, this earth dam stands at a height of 16.2 feet with a hydraulic height of 9 feet, creating a reservoir with a maximum storage capacity of 340 acre-feet. The dam spans 860 feet in length and has a controlled spillway with a width of 35 feet, capable of discharging up to 350 cubic feet per second.

Despite being classified as having a low hazard potential, the dam's condition assessment in 2020 rated it as fair. The risk assessment for the dam is very high, emphasizing the importance of regular inspections and maintenance to ensure its continued safety and functionality. The Wisconsin Department of Natural Resources is responsible for regulating and inspecting the dam, which is situated on Rock Creek. With its scenic location and recreational opportunities, Rock Creek Flowage Dam serves as both a vital water resource and a popular destination for water and climate enthusiasts in the region.

Year Completed

1969

Dam Length

860

Dam Height

16.2

River Or Stream

ROCK CREEK

Primary Dam Type

Earth

Surface Area

26

Hydraulic Height

9

Drainage Area

2

Nid Storage

340

Structural Height

16.2

Hazard Potential

Low

Nid Height

16
       
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.