Clam Falls Reservoir Report

Last Updated: December 6, 2025

Located in Clam Falls, Wisconsin, the Clam Falls dam stands as a testament to the region's rich history of hydroelectric power generation.


°F

°F

mph

Wind

%

Humidity

Summary

Completed in 1875, this gravity dam on the Clam River serves multiple purposes, including hydroelectric power generation and recreation. With a height of 36 feet and a storage capacity of 950 acre-feet, the dam covers a surface area of 127 acres and has a drainage area of 65 square miles.

Despite its historical significance and important role in the local ecosystem, the Clam Falls dam is facing challenges. A recent inspection in December 2020 revealed that the dam is in poor condition, with a significant hazard potential. The risk assessment has been classified as very high, raising concerns about the dam's safety and the need for proper risk management measures. With a history of modifications dating back to 1942, the Clam Falls dam continues to be a focal point for water resource and climate enthusiasts interested in the intersection of infrastructure, conservation, and sustainability.

Years Modified

1942 - Other

Year Completed

1875

Dam Length

80

Dam Height

36

River Or Stream

Clam River

Primary Dam Type

Gravity

Surface Area

127

Hydraulic Height

32

Drainage Area

65

Nid Storage

950

Structural Height

36

Hazard Potential

Significant

Nid Height

36
       
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.