Lake Sunapee Protective Association


Devoted to the Environmental Quality of the
Lake Sunapee Watershed

Curly-leaf Pondweed Discovered in Lake Sunapee


Please keep an eye out when you are on the lake!


On Monday, May 27, one of our Lake Hosts pulled a piece of curly-leaf pondweed off the trailer of a departing boat leaving Lake Sunapee at the Georges Mills ramp (see photo below). LSPA responded quickly by paddling the area to look for any signs of the invasive plant in the water.

Unfortunately, we found ~10 (or less) plants, ranging in size from about 1-2 feet off the bottom up to approximately 6 or 7 feet tall. NHDES was alerted right away and helped us to coordinate with divers who will hand-pull the plants on June 5.


We do not have any reason to believe that this infestation is widespread in the lake but we will be checking over the next few weeks and throughout the summer. We have also alerted our Invasive Watchers, a network of over 50 volunteers around the lake, to be extra vigilant this season to keep an eye out for curly-leaf pondweed and other invasive species. We can never have too many eyes on the water, so if you are interested in becoming an Invasive Watcher, please send an email to Susie at susieb@lakesunapee.org.


Below is a picture taken last week of curly-leaf pondweed in Baptist Pond which is the closest known location of this invasive species. Here are some identification tips:


  • Edges of leaves are wavy (like lasagna noodles) and have small “teeth”
  • Leaves are alternate on stem & are more dense toward end (tip) of branches
  • It starts growing and blooms earlier than most other aquatic plants

Thank you to our members and volunteers who make it possible to respond quickly and effectively. Early detection is key! If you see anything suspicious please let us know ASAP at 603-763-2210 or susieb@lakesunapee.org. And, always remember to "Clean, Drain & Dry" your boat, trailer and equipment between waterbodies to help prevent the spread.

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Lake Sunapee Protective Association

Center for Lake Studies


Physical Address:

63 Main Street

Sunapee, NH 03782


Mailing Address:

PO Box 683, Sunapee, NH 03782


www.lakesunapee.org