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Water chestnut is an invasive plant that has the potential to spread and get out of control. It is wreaking havoc on native plants and animals and interfering with recreation on our rivers. 

This map shows all reported water chestnut (aka Trapa natans) infestations within the Connecticut River Watershed. This map is continuously updated as stewards, monitors and the other river users report new infestations and report on the status of existing ones. Water chestnut infestations have been reported in all four states within the watershed – NH, VT, MA & CT. 

How to use the Map:

Each reported infestation has been registered as a station within the map. At each station a variety of parameters are recorded such as intensity of infestation, last monitoring date,  estimated square footage and much more. To learn more about a specific station simply select the icon and read through the pop up. Use the filters along the left side of the map to select which parameters you want to sort through.

Interactive Map
At a Glance
Volunteer Opportunities
Recognizing Partners

Water Chestnut At A Glance

The water chestnut is a rooted, floating aquatic plant. It is an annual plant not native to the United States, categorized as an invasive species in the Connecticut River Watershed. It is fast growing and quickly reproducing. If left unattended it will easily cover an entire waterbody. 

Water chestnut infestations have been found in each of the four states – CT, MA, NH, VT, that the CT River travels through. To learn more about the origins of water chestnut and removal efforts in the CT River, visit our What is Water Chestnut page!

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Interactive Map
At a Glance
Volunteer Opportunities
Recognizing Partners

Volunteer Opportunities

Good news! Water chestnut is easy to identify and can be managed by trained volunteers. Together, we can do something about it! Plus, it’s a great opportunity to get on the water and have some fun…all for a good cause. 

Attend a Pull or Organize Your Own

Pulling events typically occur from June through August. Events are part of a multi-organizational collaboration united in the goal of removing this invasive plant from all parts of the Connecticut River basin. Use the calendar to find a pulling event near you or search by organization! 

If you choose to attend an organized pull we will provide supplies and instruction on how to pull the plants. It’s easy to do, but technique is important. You are welcome to bring your own boat, rent a boat, or contact us for other options. While this is generally a paddle event, shallow motor boats are helpful to shuttle loads of plants back to land.

Water Chestnut Events

There are no upcoming events at this time.

Interactive Map
At a Glance
Volunteer Opportunities
Recognizing Partners

Recognizing Partners

Water chestnut removal in the CT River Watershed has long been a priority for organizations, groups and individuals across all four states. The launch of a new water chestnut website and reporting system in 2020 builds on the work that these groups have completed for decades and seeks to grow and develop the collaborative effort started many years ago! Coming soon, learn more about the history of water chestnut removal and the groups who got it started.

THANK YOU to the Community Foundation of Western MA for supporting this work in MA!

THANK YOU to the Rockfall Foundation, Sustainable CT, Friends of Whalebone Cove, US Fish and Wildlife and the private donors who contributed to funding this project in CT!