Clark County 1 Reservoir Report

Last Updated: December 13, 2025

Clark County 1, located in Clark County, Wisconsin, is a gravity-type dam completed in 1934 for recreational purposes on the Fivemile Creek.


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Summary

The dam stands at a height of 7 feet with a hydraulic height of 4.3 feet and a length of 36 feet. It has a storage capacity of 120 acre-feet and a drainage area of 3.4 square miles, with a maximum discharge of 322 cubic feet per second. Despite being rated as having a low hazard potential, the dam is deemed to have a very high risk due to its condition assessment being not rated.

This dam is under the jurisdiction of the Wisconsin Department of Natural Resources (WIDNR), which regulates, permits, inspects, and enforces standards for its operation. The last inspection of Clark County 1 was conducted in September 2009, with a scheduled inspection frequency of 10 years. While the dam has not been assessed for its condition recently, it is crucial for water resource and climate enthusiasts to monitor its risk level and management measures in light of its potential impact on the surrounding area in the event of an emergency.

With its controlled spillway and surface area of 14 acres, Clark County 1 serves as a crucial recreational structure in the region. As a part of the Detroit District and Congressional District 07 of Wisconsin, this dam plays a significant role in providing recreational opportunities while also posing potential risks that should be carefully managed and monitored by relevant authorities and stakeholders in the water resource and climate community.

Year Completed

1934

Dam Length

36

Dam Height

7

River Or Stream

FIVEMILE CR.

Primary Dam Type

Gravity

Surface Area

14

Hydraulic Height

4.3

Drainage Area

3.4

Nid Storage

120

Structural Height

7

Hazard Potential

Low

Nid Height

7
       
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.