Aquatic Plant Control


Results of Lake survey and the results of the whole lake herbicide treatment:


Click here to view the Whole Lake Herbicide Results Document, 65 pages

In addition, below is a quick summary, emailed from Jim Scharl of Wisconsin Lake and Pond Resource LLC:

Attached is the report summarizing the 2021 EWM treatment and whole-lake survey results.  It includes results for not only the 2021 grant funded portion, but we were also able to take a look at the whole-lake fluridone results from 2020.  Finally, the report also includes 2022 management recommendations which I'll get going ASAP.

In quick summary, all the EWM control (2020 and 2021) was largely very successful.  They all significantly reduced populations of EWM while limiting non-target impact.  The 2020 whole-lake treatments continued to show very good results with significantly less need for harvesting in 2021.  I hope that continues this year.


There were minimal areas from our 2021 surveys that we identified as dense enough to warrant control in this year.  These were called out for ProcellaCOR management and will follow the same procedures that we did in 2021, including pre/post-treatment sub-pi surveys, residual monitoring, and a year end report.  I sent the below in a past e-mail, but it bears repeating as it remains very true for this project:


2022 Notes - Overall, we continue to be ahead of the game on the grant.  There was no noted impact from ProcellaCOR in 2021 even with excellent control of EWM.  We are planning to continue the use of ProcellaCOR at all proposed treatment areas for 2022.  Follow-up surveys will be necessary in 2022 to continue to monitor results - these are included in your grants.

The EWM population in McCaslin Brook is significantly less than anticipated.  The outlined costs for EWM control in the grant will not be necessary and I hope to re-allocate these towards control in other areas of the lakes - including those outlined above.  By doing this we can impact greater areas while also extending the life of the grant.  Meaning, we can hopefully get more years of control at the same cost.  These actions would require a grant amendment to extend it or move some money around.


June 6, 2021

EWM Control Strategy Report

Following are the documents relating to the Aquatic Plant Management Herbicide Treatment currently being done on the TFPD:

Aquatic Plant Management Herbicide Treatment Record

Residual Sampling Locations

EWM Treatment Locations

2019 Grant Report Herbicide Enclosure Study (Curtains)

Pictures in Gallery Below

The Eurasian Watermilfoil (EWM) invasive plant is a continually growing problem in the flowage and surrounding lakes and waterways. A lake study detailing the problem and potential solutions was prepared by Cason & Associates of Berlin, WI. The study identifies the weeds, water clarity, water temperature, oxygen levels and other points. The most recent lake study shows that in general, the lake is healthier than it has been in years past. This is due a combination of the controls and regulatory aspects of the use of phosphorus, septic tanks, etc. improvements have had a positive impact.

Click here to read the Comprehensive Lake Management Plan. Please note the file size is 10+mb.

Another lake study needs to be performed in 2020 to be able to qualify for a new weed harvesting permit.  Each year a portion of the budget is reserved to enable the lake study to be performed.  

Click here to view the Eurasian Watermilfoil picture

Click here to read a description of the Eurasian Watermilfoil

The use of herbicides in the Townsend Flowage may not be effective due to the continually moving water and is very expensive.

Additionally,, the DNR will not be issuing any permits to use herbicide treatment unless a bathymetry study is performed, which is estimated to be in excess of $100,000.   

The most effective method of controlling invasive weeds is by pulling the weeds in a proper manner.  Briefly described, the process includes pulling the plant up by the root, putting it into the boat, and disposing of it in a proper manner. The most important part of the method is to get the root.

Click here to read the Spring/Summer Citizen Lake Monitoring Network (CLMN) Monitor

Click here to read about the Wisconsin DNR Draft Strategy for aquatic invasive species


Oconto County Healthy Lakes Cost Share Program

There is approximately $340,000 available from the Oconto County Healthy Lakes Cost Share Program to provide financial assistance to communities to enhance, protect and restore water quality, fish and wildlife habitat, tourism and recreational values.  

Successful applicants will be eligible for funds up to 10% of the total project cost if applicant is receiving other state or federal grants, or up to 50% if the applicant is not receiving state or federal grants.  A maximum cost share cap will be 10%/50% or $7,000 limited to whichever cap is reached first.  The annual funding pool will be set at $35,000 unless otherwise approved by the Oconto County Land Conservation Committee.  

Applications will be accepted from January 2nd to September 15th of each year.  The Land Conservation Committee will make final awards by November 30th of that year. 

Healthy Lake Grants are available for individual property owners who wish to make improvements such as rain gardens, rock infiltration, fish sticks, native planting and diversion.  These grants must be applied for by the TFPD for multiple lakeshore owners.  The grants provide up to $1,000 per Best Practice and up to $25,000 for an eligible applicant applying on behalf of multiple property owners. More information can be found at  

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