Loon Lake WA Property Owners Association
Loon Lake WA Property Owners Association

Loon Lake Milfoil Report 

July 9, 2019 Loon Lake will be treated with Procellacor by Aquatechnex. More Info?

Go to website: loonlakewa.wordpress.com 


By Lee Evans Loon Lake LMD Chairman

Over the last three years the Loon Lake Lake Management District under the direction of Stevens County has been working with the Washington State Department of Ecology following the guidelines of a Water Quality Aquatic Invasive Plant Funding Agreement (Grant).DOE’s Overall Goal for this grant is “To maximize efforts to identify andimplement the most effective treatment for this new, hybrid strain of watermilfoil on Loon Lake and prevent its spread to other regionalwaterbodies.” Final Task #5 of our grant is a lake wide application with the suggested herbicide from grant Task #3 and 4.

It has been determined (from grant task 3 and 4) the Best Available Technology is a chemical called ProcellaCOR. Some of the benefits include, lower costs low volume use rates. No Swimming, fishing or human potable water restrictions. No turf irrigation restriction. This herbicide is a systemic product that is selective for Eurasian Milfoil and hybrid strains of aquatic weed. Reduced Risk herbicides are a new class of products recognized by EPA in February of 2018. The US EPA issued registration of ProcellaCOR the new reduced risk aquatic herbicide to this category because it has a better environmental profile than current registered products. It also has the fastest uptake time of any of the aquatic herbicides available which was also proven in our study, making it more effective in high water exchange environments. Applicators have been able to use this technology for over a year in other states. In addition, 1 or 2 pints of this product replaces between 200 and 400 pounds of 2,4D reducing the amount of herbicide needed.

Ecology felt however that the NPDES permit required an amendment. Initially, the Department was going to delay amending the permit until the next permit cycle some years in the future. After considerable public input to DOE, last summer agreed to move ahead with a permit amendment. The public comment period on this closed in December, over 4 months ago. This permit was promised to be available for use in May of 2019. We recently found out that because of priorities within the Department it will be delayed until July 5th of 2019 maybe longer. The original May approval would have allowed the LMD to complete the grant requirements and meet the June 30, 2019 deadline.

spring/summer 2018 by Lee Evans LMD Chairman

For over 2 decades Loon Lake property owners have self-funded our Lake Management District to target Eurasian Milfoil and other invasive aquatic lake plants. In the twenty plus years of treatment which included bottom barriers and diver removal in the early days to herbicide treatment of over 100 acres of plants scattered around the shallow areas of the lake. In the past several years 2015 and 2016 it became apparent we were losing ground despite Best Management Practices to control our milfoil. In the fall of 2016 nine samples from various treatment zones were sent for DNA analysis. Results for all nine samples confirmed a hybrid cross of Eurasian and Northern Milfoil a strain that’s proven extremely challenging and commonly 2,4-D tolerant. 

This new discovery in 2016 lead to our Lake Management District with the help of Stevens County and Aquatechnex to write a grant proposal applying for and receiving a Water Quality Aquatic Invasive Plant Funding Agreement thru the Washington State   Department of Ecology for $75,000 and $25,000 matching from our LMD for $100,000 total. The DOE goal is to develop an aggressive treatment strategy to keep Loon Lake from becoming a hybrid seed source for other regional waterbodies. Knowing that this hybrid water milfoil poses a greater threat than Eurasian Milfoil, a class B noxious weed in Washington State. 

We are now in year two of our three year study. The summer and fall of 2017 was spent gathering samples for DNA analysis at Montana State University and samples for growing at the University of North Carolina with the purpose of determining the best possible chemical herbicide’s that will identify the Optimize Contact Exposure Time (CET)  necessary to aggressively kill the plant and the plant roots. The study results are nearing completion which will allow us to take the next step to control our Loon Lake hybrid milfoil. However new to Loon Lake the hybrid plant has been around for some time. While attending the North West Regional Lake conference last year the topic of hybrid milfoil was addressed with Lake Coeur d’Alene in Idaho having five different types of hybrid milfoil requiring five different treatment methods. Fortunately all hybrid milfoil plants from Loon Lake are the same species.  

The Loon Lake LMD Advisory Board will be looking for new members this season. We have had several members resign and several members have moved from the area. Your advisory board members are Barry Smith from the Granite Point area, Denny Drinkard Silver Beach, Jim Nimnicht Larson Beach, Daryl Howe Carlson Bay and Lee Evans North Shore.  If you have an interest please let us know. We can have as many as 9 board members. Board meetings are the second Monday of the month 6:30 pm in the basement of the old school house. All are welcome and we value your input.

An FYI this is the last year of our current 5 year LMD tax assessment. Our board feels it will be necessary to continue with an additional 5 year milfoil commitment at the same tax rate with no tax increase necessary. Your milfoil assessment ballot will be on its way later in the year,

Thank you for your cooperation and support. 

Fall 2017 Report Loon Lake Milfoil LMD

Lee Evans LMD Chairman 

The spring/summer of 2017 started very wet and cold with near record setting high water levels in our lake. This resulted in some very unusual milfoil activities. As you may remember the Loon Lake LMD applied for and received a monetary grant from the Department of Ecology. The purpose of the grant is to study and develop effective methods to control or eradicate the newly discovered hybrid variety of milfoil discovered in Loon Lake last summer (2016).

 In an attempt to follow the grant procedures step one requirement was to collect multiple milfoil samples for a more in-depth DNA analysis of the plants, knowing that the process would likely take several months or more to fully analyze the new hybrid milfoil plants sent to Montana State University research facility.  With this in mind we scheduled the first sampling foray in early June. The results of this effort were mixed. AquaTechnex (vendor selected to administer the grant requirements) with the assistance of LMD advisory board members were unable to find any milfoil plants to sample. A second attempt was scheduled in early/mid July similar results.

The few plants collected in July were not of good quality and not considered good specimens for testing. All good news for those of us who don’t want to see milfoil around our docks or swimming areas, but not a good start for the grant process. Late August brought success with the sampling efforts. Many plants were found all robust and growing vigorously. Quality samples were collected and sent away for analyst. Step two is to collect samples for a grow operation located at the University of South Carolina once the DNA has been established. The growing plant will then be subjected to various herbicide exposures to determine best methods for treating our hybrid plant. We may not be back on track with grant timelines due to factors beyond our control, but feel confident in our progress. The plant collection for the growing operation will happen in mid October (2017) as well as a discussion with our herbicide application team about using a contact herbicide on plants this fall that we feel will become a fragmenting problem later this fall and winter. 

            One very positive step the LMD Advisory Board went forward with this year was the purchase of GPS equipment to aid in our efforts to find and track the milfoil. GPS equipment has been a topic of board discussion for the last several years debating the pros and cons. The decision was based on our ability to assist any vendor with surveys and eventually assuming all survey responsibility. We continue to look for additional advisory board members who have an interest and would like to help Loon Lake with Invasive Species control. The Advisory Board that include George Swannack, Barry Smith, Steve Pehl, Denny Drinkard, Daryl Howe, Jim Nimnicht  and Lee Evans meets on the second Monday of each month during the season usually April to September at 6:30 pm in the basement of the Old School House. We would encourage your involvement as there are two board position available. Please note our meeting are open to the public. All are welcome.                   

Milfoil May 2017
5 2017 Milfoil update Lee Evans.pdf
Adobe Acrobat document [57.6 KB]

Fall 2016

Loon Lake Hybrid Milfoil

by Lee Evans LMD Chairman

The Loon Lake Advisory board for controlling milfoil and other noxious weed in Loon Lake experienced another difficult year with our efforts to control the growth of milfoil on our lake. The 2016 season started by selecting a new vendor Aquatechnex to survey an apply herbicides to combat the ever growing challenges we have seen with milfoil in Loon Lake. This season started on a more positive note with an early survey that discovered approximately 37 acres of actively growing plants. Following the survey an herbicide application on June 27 and 28 was completed on the 37 acres using a granular form of 2,4-D which has proven to be very effective on Eurasian Milfoil with results noticeable in 10 to 14 days. Aquatechnex preformed a post treatment survey on July 25th nearly a month after the initial application and discovered very poor results from the June treatment. An additional survey was conducted in mid-August when 9 samples of plants were collected and sent to the independent lab GenPass LLC from Muskegon Michigan. Each of the 9 samples came back as hybrid cross of Northern and Eurasian milfoil. Recent research indicates that hybrid milfoils may exhibit increased tolerance to some herbicides. On average, hybrid milfoil is less susceptible to control with the commonly-used aquatic herbicide 2,4-D in comparison with Eurasian milfoil. The decreased sensitivity to 2,4-D appears to be common across different hybrid lineages. Lakes that have been treated historically with 2,4-D have a higher incidence of hybrid milfoil than non-treated lakes. This research suggests that use of certain herbicides may inadvertently allow tolerant hybrid milfoil to gain dominance. 

Now that we have discovered the hybrid milfoil plant in our lake we can now take steps to combat our problem. In late September Aquatechnex suggested the use of a contact herbicide on the nearly 100 acres of actively growing plants.  The contact herbicide would kill the body of the plant to limit further fragmentation thru the fall and winter and early spring. This would however not kill the root system and suggested a follow up next spring using an herbicide that would better deal with the roots of the hybrid plant. Two members of the Advisory board Denny Drinkard and Lee Evans were on the lake with the Aquatechnex crew during the September application to answer home owner question and found additional plants not surveyed.  

The Loon Lake LMD (Lake Management District) advisory board works in cooperation with the Stevens County Board of Commissioners with all decisions approved by the commissioner’s office. We meet the second Monday of each month at 6:30 pm in the basement of the Old School House during the season starting in March. We welcome your interest and participation in this process. I would also like to thank the members of the LMD board for their continued efforts. They are George Swannack, Steve Pehl, Barry Smith, Denny Drinkard, Daryl Howe, Lee Evans and Bob French. If you have an interest and would like to serve on this board please contact any board member for information.  


Your Lake Needs            You!!

Become a Member of LLPOA!

Come to a meeting or contact 

LLPOA President

Deanne Darlene



Loon Lake Property Owners Association

PO Box 165

Loon Lake, WA 99148

$20 membership dues


Click on Calendar/Events tab at top of website for more details.



Sept 1, 2109

8:00 am -12 p.m

Buy your presale tickets from any LLPOA Board Member


Chipper Day

October 19 


Agar Rd bring your clean green!



Milfoil Treatment

July 9 

for more info



LLPOA Meetings:

The second Thursday of the month - 6:30 p.m. at the historical Old Schoolhouse



Loon Lake Milfoil Questions
LMD Advisory Committee:

   Lee Evans-Chairman
        N. Shore - 233-0179
Dennis Drinkard-Silver Beach

   Tom Hale - Sunset Bay
   Daryl Howe-Carlson Bay

   Henry Howe - Carlson Bay

   Jim Nimnicht - Larson Beach

   Aaron Impecoven - N.Shore

   Deanne Darlene, Secretary - N. Shore

   Lee Mellish - Shore Acres

   Deanna Yamane - Shore Acres


Public is Welcome to attend                     
Advisory Board Meetings
2nd Monday each month
    6:30 p.m. Old Schoolhouse

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