Brimstone Group Reservoir Report

Last Updated: December 5, 2025

The Brimstone Group in Richland, Wisconsin is a privately owned earth dam constructed in 1974 by the USDA NRCS for fire protection, stock, or small fish pond purposes.


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Summary

The dam has a height of 23 feet and a hydraulic height of 15 feet, with a length of 560 feet and a storage capacity of 85 acre-feet. It is regulated by the Wisconsin Department of Natural Resources and undergoes regular inspections to ensure its fair condition and low hazard potential.

Located in the St. Paul District, the Brimstone Group dam serves as a vital resource for the surrounding area, with a drainage area of 0.4 square miles and a maximum discharge capacity of 43 cubic feet per second. Despite its moderate risk assessment rating of 3, the dam's emergency action plan and risk management measures are currently not documented. With its proximity to the U/N Tributary to Byrds Creek, the dam plays a crucial role in water resource management and climate resilience efforts in the region.

As water resource and climate enthusiasts, the Brimstone Group dam presents an intriguing case study for understanding the intersection of infrastructure, environmental regulation, and emergency preparedness. With its history of construction, regular inspections, and fair condition assessment, this earth dam exemplifies the importance of sustainable water management practices in mitigating risks and ensuring the safety and security of communities in Wisconsin.

Year Completed

1974

Dam Length

560

Dam Height

23

River Or Stream

U/N Trib. to Byrds Cr.

Primary Dam Type

Earth

Surface Area

5

Hydraulic Height

15

Drainage Area

0.4

Nid Storage

85

Structural Height

23

Hazard Potential

Low

Nid Height

23
       
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.