Roubaix Lake Reservoir Report

Last Updated: December 5, 2025

Roubaix Lake, located in Nemo, South Dakota, is a federally owned water resource managed by the Forest Service.


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Summary

This earth dam structure was completed in 1936 and serves primarily for recreation and fish and wildlife purposes. With a dam height of 20 feet and a maximum storage capacity of 92 acre-feet, it holds a significant hazard potential and has a very high risk assessment rating.

The lake is situated along Middle Boxelder Creek, with a drainage area of 8 square miles and a controlled spillway width of 15 feet. Despite not having a rated condition assessment, Roubaix Lake remains a popular destination for water and climate enthusiasts seeking outdoor activities such as fishing, boating, and wildlife observation. This man-made reservoir contributes to the diverse ecosystem of Lawrence County, South Dakota, and plays a vital role in water conservation efforts in the region.

While the dam has not been modified in recent years, regular inspections and risk management measures are crucial to ensure the safety and integrity of Roubaix Lake. With its serene surroundings and recreational opportunities, this water resource serves as a valuable asset for both locals and visitors alike, highlighting the importance of sustainable water management practices in the face of changing climate conditions.

Year Completed

1936

Dam Length

275

Dam Height

20

River Or Stream

MIDDLE BOXELDER CREEK

Primary Dam Type

Earth

Hydraulic Height

15

Drainage Area

8

Nid Storage

92

Structural Height

25

Outlet Gates

Other Controlled

Hazard Potential

Significant

Nid Height

25
       
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.