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Milfoil Program


Invasive Plants (Variable Milfoil)


The STOP Milfoil program is a collaboration between Belgrade Lakes Association (BLA) and 7 Lakes Alliance. It has raised funds since 2011 to combat variable milfoil in Great Pond. 


Invasive variable milfoil was found in Great Pond in 2009. The STOP Milfoil program was created to keep the invasive plants from spreading to other parts of Great Pond as well as other lakes, it includes milfoil removal, Adopt A Shoreline, Courtesy Boat Inspections, and Plant Paddles.



Adopt-A Shoreline


Adopt-A Shoreline is a program that enlists and trains volunteers from the community to survey their shorelines. The volunteers are educated on how to find and identify invasive aquatic plants, specifically variable milfoil. Adopt-A-Shoreline is working to adopt the entire 77 miles of shoreline at risk in Great Pond and Long Pond.


Volunteers come to the Maine Lakes Resource Center and learn about 11 Maine’s most unwanted invaders. Using live plant samples, volunteers learn how to identify aquatic plants in a one hour session. Volunteers also receive resources like waterproof identification cards to help them identify plants during their survey.


Adopt A Shoreline is open to anyone who lives on Great Pond or Long Pond, but everyone is encouraged to come to the session and learn about invasive aquatic plants to protect their own waterbodies.

Frequently Asked Questions (FAQ)

Plant Paddles


Invasive plant patrol does not stop on Great Pond and Long Pond, 7 Lakes Alliance leads a plant paddle on East Pond, North Pond, Salmon Lake, and McGrath Pond. Using aquascopes and snorkels, a group of 7 Lakes Alliance staff, volunteers, and lake association members, search the lake for invasive plants. We are always looking for more volunteers to help on plant paddles, even if you do not live on the waterbody that is being surveyed, we need your help. Plant paddles are a fun way to kayak with purpose!


To volunteer, email

Courtesy Boat Inspections (CBI)


Maine, is in a critical time in terms of invasive plants. Fortunately, our lakes and ponds tend to be much colder slowing spread of these species but as global temperatures rise so do the opportunities for further infestations. Maine is in an auspicious position where invasive issues can be addressed before they become critical. Great efforts have been made to prevent the introduction of new invasive plants as well as limit the spread of existing ones to other Maine waters.

The first lines of defense in combating this issue are prevention and education. The Courtesy Boat Inspection program developed through the Maine Department of Environmental Protection is the first defense against invaders. A cost-share grant funded by Preserve Maine Waters’ “milfoil sticker”, lake associations, local towns, BLA’s Stop Milfoil program and generous donors provide the financial support for the CBI program. The purpose of these voluntary inspections is to reduce the spread of invasive aquatic plants by boats, trailers, and associated equipment to Maine waters. CBIs offer boaters assistance in inspecting both motorized and non-motorized, trailer and other equipment entering as well as leaving the water. This program provides an opportunity to connect and educate the community on the impact of invasive species. As well urge boaters to inspect their boats ensuring that they would not be a vessel for transport.

7 Lakes Alliance has a mixture of paid and volunteer CBIs that cover the five ponds in the Belgrade Lakes region including Long Pond, Great Pond, North Pond, East Pond, and Salmon Lake. These CBIs cover the boat launches 7 days a week from Memorial Weekend unto Labor Day Weekend. In 2018 9,494 boats were inspected between the five boat launches. 411 plant fragments were recovered, two of which were invasive.

Maine is becoming more vulnerable to invaders and there are several things that can be done to ensure the future of Maine’s freshwater habitat:




  1. Check for and remove all plants from boats, motors, trailers, 
    and fishing equipment before and after launch.

  2. Know your lakes. Avoid areas that have known infestations.

  3. Activities such as fishing can create fragments and spread the infestation to other areas. 

  4. Clean: plant debris, mud, and algae from all boating and fishing gear
    and dispose of in the trash

  5. Drain: live well, bilge water, and engine water away from the waterbody

  6. Dry: any gear that comes into contact with the water.    


  1. Become a volunteer CBI

  2. Become trained to recognize invasive plants through the Lakes Stewards of Maine.

  3. Adopt your Shoreline

  4. Keep your eyes on the water and join a plant paddle.


The Milfoil removal crew works throughout the summer in Great Pond and on Belgrade Stream looking for, and removing variable milfoil. They use multiple methods including Diver Assisted Suction Harvesting (DASH), hand pulling, and benthic barriers. Using many years of expertise, our team makes evidence based decisions on how to combat and control the invasive variable milfoil infestation in Great Pond.


2018 Milfoil Update

The threat of variable milfoil is still very much alive. The discovery this summer of Eurasian milfoil and European Frogbit only 15 miles away in Cobbossee Lake was a scary reminder of the importance of our efforts to prevent and stop milfoil and other invasive plants. The STOP Milfoil crew was out all summer protecting our watershed from invasive aquatic plants. Day in and day out, they snorkeled miles of shoreline, hauled pounds of milfoil, and worked in waist deep muck. The STOP Milfoil crew is not only certified to look for variable milfoil, but all 13 invasive plant species threatening Maine’s waters.


In 2018, the crew removed 16,800 gallons of variable milfoil using diver assisted suction harvesting (DASH), and with the help of New England Milfoil. 7 Lakes Alliance hired 7 crew members who surveyed, identified, and removed variable milfoil. The crew also deployed benthic barriers -- tarps weighed down with rebar – to starve the plants of sunlight over 45-90 days. The barriers are then removed. Although benthic barriers effectively kill invasive plants, they are not ideal for many situations including shallow areas, streams with current, and high boat traffic areas.


Prevention is still the most critical and cost-effective way to control invasive aquatic plants! The STOP Milfoil crew surveyed the entire shoreline of Great Pond and Long Pond. Roughly 50% of the shoreline was snorkeled, and the rest was paddled and observed through Aquascopes. Trained volunteers also helped survey shoreline through our Adopt-A-Shoreline Program.


The STOP Milfoil crew did not find any new infestations! However, the infestation in Great Meadow Stream is thriving, aided by low water levels and abundant sunshine. Variable milfoil also persists in known locations such as Robbins Mills and Rome Trout Brook. The focus of our efforts is to remove as much as possible and to contain and prevent the spread of the infestation. Without these serious and ongoing removal efforts, the infestations likely would have doubled, or even tripled in size. In New England as well as our own Belgrade Lakes, there are numerous reminders that, without vigilance – invasives spread rapidly, ruining swimming, boating, wildlife habitat, and property values. We are analyzing results, working with DEP and other experts to develop the most impactful and cost effective approach to fight back against milfoil in 2019.


- October 2018, Lauren Pickford & Sharon Mann



Variable Milfoil Infestation Locations and Adopted Shoreline