Plant Survey

Specially trained staff members and volunteers identify and document locations of and levels of invasive plant infestations in our waters.  The data is then used to create a comprehensive map that will show the location and level of infestation of variable milfoil as well as eurasian milfoil so that we can determine the best harvesting locations for maximum impact.


This maps is showing all of the areas of the lake that can support plant growth (the yellow region).  This region of plant growth is called the littoral zone, the litoral zone usually conists of low water level areas (~15 ft in depth or less) that are able to get sun light to the bottom so that the aquatic plant can photosynthesize.  As you can see in this map, there is a lot of area for the surveyors to cover.  The red areas on Annbessacook are known locations of invasive Variable Milfoil.

How to identify varaible milfoil

Variable milfoil has a central stem (which may be green or red in color) with whorls of 4 to 6 feather-like leaves areound it.  Due to these whorls, milfoil has a bottlebruch like appearance.

For more information and materials to help you learn more about milfoil click here.

 The "lake squirt" doning its sweet new awning made specially for it by a very generous patron.

The "lake squirt" doning its sweet new awning made specially for it by a very generous patron.

Our Surveyors

Whether you see them swimming, paddleing, or boating around the shore line our surveyors are diligently scouring the lake floor looking for any unwelcome invasive species.  Sometimes it isn't the most glamorous job but these folks are made of tougher stuff.  Make sure to give them a wave or a shout out when you see them on your lake!  (If you see the boat in the image above on Cobbossee lake that is the Special Ops team and there task is to survey ALL of Cobbossee lake this summer!  So, be sure to give them a smile or approving nod as they have a lot of work to do.)

 A lovely scene on Cobbossee Lake.

A lovely scene on Cobbossee Lake.

How shorefront owners can help

The three things shorefront need to remember if they see a suspicious plant are: 

Spot it!  -  If you see a plant that you think may be invasive milfoil take note of its location so that we may be able to find it agin.

Snap it!  -  Take a photo of the plant.  Removing it may cause fragments to float away allowing the plant to spread even more!  Taking a photo is the best way to document it and we will do the rest.

Send it!  -  Send us your photo so that our trained staff can identify the plant, and determine if it needs removal or if it is a safe native.

Here is a helpful guide that can assist you in identifying invasive milfoil and what to do if you think you have found some.

Send to