Missouri River Water Management News

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Vegetation control to begin on Lewis & Clark Lake

Published Oct. 4, 2018

SPRINGFIELD, S.D.—The U.S. Army Corps of Engineers will conduct vegetation management activities on sandbars in the upper portion of Lewis & Clark Lake during October 2018.


The Corps of Engineers has identified approximately 1,200 acres for treatment. This work is being done to help control invasive common reed (Phragmites spp.) that has become prevalent in the area. 


Certified applicators using helicopters will begin spraying during the first half of October when weather conditions allow. Spraying will be done using glyphosate and imazapyr herbicides, both of which the U.S. Environmental Protection Agency has approved for aquatic use.


Spraying will take place only when environmental conditions allow, such as little to no wind and no rainfall in the immediate forecast. While efforts will be made to conduct spraying during the week, when public use is lower, spraying may occur on weekends since good spraying days can be limited due to wind or rain.


The Corps of Engineers will evaluate the success of this treatment in the coming years. This evaluation will help guide future management for similar projects.


Omaha District Public Affairs Office

Release no. 18-076