Angelo Dam Reservoir Report

Last Updated: December 14, 2025

Angelo Dam, located in Monroe, Wisconsin, is a historic structure completed in 1920 with a height of 20 feet and a length of 615.5 feet.


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Summary

Situated on the La Crosse River within the St. Paul District, this dam serves multiple purposes, including controlled spillway operations and water storage with a capacity of 450 acre-feet. The dam features a Tainter radial gate system with 4 gates and has a low hazard potential.

Managed by the Federal Energy Regulatory Commission, Angelo Dam has a very high risk assessment rating of 1, indicating the need for careful monitoring and risk management measures. Despite its age, the dam's condition assessment is currently not available, with the last inspection conducted in August 2018. Emergency action plans have been prepared, with the latest revision in March 2020, to ensure the safety and security of the surrounding community in the event of a potential breach or emergency situation.

For water resource and climate enthusiasts, Angelo Dam presents an intriguing case study of a historic infrastructure with ongoing management challenges in the face of changing environmental conditions. Its strategic location and vital role in water storage and flood control make it a focal point for understanding the intersection of human engineering and natural forces in the context of sustainable water resource management.

Year Completed

1920

Dam Length

615.5

Dam Height

20

River Or Stream

La Crosse River

Surface Area

52

Nid Storage

450

Outlet Gates

Tainter (radial) - 4

Hazard Potential

Low

Nid Height

20
       
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.