Variable Milfoil & lake quality

January 2016

As Chairman of the NH House Committee on Resources, Recreation and Development, I will be chairing public hearings on several related bills  One in particular is House Bill 1589.which deals with cleaning and draining boats and trailers as part of the prevention of transport of Aquatic Invasive Species (AIS) from one water body to another. The NH Lakes Association has been actively supporting this bill.

May 26, 2015  MERRIMACK- Lake Naticook continues to have some milfoil.  There are currently four spots marked and in the next few weeks, a representative from DES will be on the lake to confirm the locations and divers will be scheduled to hand pull milfoil at these sites.  No herbicide treatment is planned for 2015.


May 4, 2015   AMHERST and MERRIMACK-  (Map below) In June 2014, an active weed Watcher on Baboosic :Lake reported milfoiul infestration on the Amherst side of the lake, near the boat launch and in that cove.  Local residents were trained and certified as divers to remove milfoll by hand pulling.  Their efforts have been successful and this is fantastic.  A long term control plan is under development by the NH Department of Environmental Services.  No herbicide treatment is planned for 2015.

July 1, 2014  MERRIMACK- The Merrimack Town Council has closed the Naticook Lake boat ramp in Veteran’s Park until further notice due to milfoil infestation.
April 17, 2014:  Letter from NHLAKES describing solutions to erosion and stormwater runoff at Wasserman Park.  These conditions and Best Management Practices (BMP’s) could apply to other areas as well




Update November 3, 2013:  Maps added for Horseshoe Pond and Lake Naticook related to control activities for 2014.

One of my legislative duties was to chair the Exotic Aquatic Weeds and Species Committee, which deals with milfoil and other invasive species  infestations.
The Merrimack Patch, on July 16, reported that variable milfoil has been identified in the last several days in Lake Naticook . This is a non-native invasive plant that can spread rapidly and reduce property values and diminish functionality of the lake as a natural resource.  It would prevent swimming and fishing in infested areas, for example, as well as boating.  The Department of Environmental Services (DES) started management operations in the summer of 2012.  A long term management plan for Lake Naticook was published by DES in February, 2013 ( link below).

Otter Pond in Greenfield was another newly reported infestation in 2012.  It appears the milfoil there has been establishing itself over a few years, and is beyond the point of  just hand pulling.  A plan for possible herbicide treatment in the spring of 2013 is under development.

The mild winter of 2011-2012 allowed more growth and re-growth in some areas than had been anticipated in the management plans.  Two examples are Back Bay, part of Lake Winnipesaukee in Wolfeboro, NH and Lake Potanipo in Brookline, NH.

Updated maps of Horseshoe Pond and Lake Naticook were created in October, 2014 in anticipation of starting the bid process for control efforts in 2014.  The sections noted  for herbicide treatments are defensive in that permits are requested as worst case.  Actual treatment area may be smaller, or not required, depending on growth over the winter of 2013-2014.  Yes, milfoil continues to grow under the ice.

Baboosic Lake Milfoil Map_062414

Horseshoe Pond Map Oct 4 2013 for 2014 Herbicide Bids

Horseshoe Pond Map for 2014 DASH Bids

Management Plan: Horseshoe Pond Jan. 2012

 Naticook Lake Map Oct 2014 for Herbicide Bids

Naticook Lake Map for 2014 DASH and Diver Bids

Management Plan: Naticook Lake  February 2013

Naticook Milfoil Update June 2013

Naticook Erosion at boat ramp; remedy plans

Lake Naticook Boat Launch closed Oct 16 2012

Management Plan Lake Potanipo, Brookline, NH; February 2012

Lake Naticook  Milfoil Update Sept. 13, 2012

Map of Lake Naticook milfoil July 9, 2012

Map of Lake Naticook milfoil Sept. 22, 2012

Map of Otter Pond Milfoil July 2012

Back Bay, Wolfeboro, NH August 2012 news article

NHLAKES association website