Eurasian Water Milfoil Update

By Ken Schwebke

In late August and early September surveys were done to see the results of our EWM Herbicide treatment from spring 2021.

We were disappointed to find out both from the Onterra and DNRs fall surveys that the 2021 treatment was not as successful as we expected. We met Brenda Nordin at the DNR and we are thinking this could be attributed to a couple issues.

While the herbicide concentration was sufficient to eliminate the Milfoil in the treatment area, the chemical that was used may not have been the correct herbicide to use. The Milfoil may have developed a resistance to it. Another issue could have been that the Milfoil may have been blown back in the bays that were treated over the course of the summer.

Samples of the Milfoil were extracted and sent to the DNR lab to get more details of the make up so for next year we can dial in the right Herbicide and saturation levels.

We will be meeting our consultant Onterra within the next week to discuss their thoughts on our spring 2022 treatment plan.

See Summer 2021 Lake Map

Adopt a Shoreline

Adopt a Shoreline is a volunteer program that involves surveying the lake for the presence of invasive species. The purpose of the program is to identify invasive species and track their locations on Archibald Lake. Survey work consists of looking on the shore and in the shallow water for invasive plants and animals (primarily zebra mussels). Ideally, survey work should be done two or more times per summer. Training and online resources will be provided.

Clean Boats, Clean Waters

The Clean Boats, Clean Waters initiative has been running since 2003. The purpose of this activity is to help prevent any new invasive species from entering the lake. One of the most visible activities with respect to Clean Boats, Clean Waters is monitoring of the boat landing. We are fortunate to have two passionate board members in charge of this important activity.

If you would like more information and would like to participate in this activity please contact

Karla Doyle ( or
Larry Schmechel (