Weed Watchers Kit

The Squam Lakes Association is an active participant in the Weed Watcher Program started by New Hampshire Department of Environmental Services. The Weed Watcher Program instructs volunteers on the methods of surveying for and identifying invasive species and who to contact if an invasive is found. The program runs from late May through August. The following links provide further information on the Weed Watcher Program and the invasive species found in New Hampshire.

Squam Lakes Association

Milfoil Management on Squam: Overview of the milfoil management practices used by the Squam Lakes Association on the Squam water bodies. Includes annual milfoil reports, site-specific milfoil removal reports, and information on milfoil removal techniques used in the Squam water bodies.

Weed Watching on the Squam Lakes: Brief description of SLA's Weed Watching program.

Weed Watcher Mornings Program: Description of the SLA's Weed Watcher Morning program and links to future Weed Watcher Morning times and locations.

Maine Field Guide to Invasive Aquatic Plants

Our preferred field guide is available online here. Waterproof copies are for sale in our store.

Department of Environmental Services (DES)

Weed Watcher Program: Brief description of the Department of Environmental Services' Weed Watcher Program.

Conducting a Weed Watching Survey: Guidelines for conducting your own weed watcher survey.

Exotic Species Fact Sheets: Compilation of links to exotic species fact sheets, weed watcher program reports, and plant identification guides.

Aquatic Species & Algae of New Hampshire's Lakes and Ponds: Book written by Amy P. Smagula and Jody Connor that provides concise information about the aquatic plants and algae of New Hampshire. 

Plant Control Techniques: List of the various methods used to reduce and control invasive species growth.

Hydrilla Look-Alikes: PDF image showing the differences between the exotic hydrilla and the native waterweed.

Native Versus Invasive Plants: PDF image showing the differences between a number of invasive aquatic plants and native aquatic plants.

New Hampshire Lakes Association

Lake Host Program: Learn about the New Hampshire Lakes Association's Lake Host Program. The program works to prevent the spread and introduction of aquatic invasive species in the New Hampshire water bodies.

Fun things you may see while Weed Watching on Squam!

Bryozoans: Department of Environmental Service's fact sheet on bryozoans, aquatic animals that filter-feed as a part of large colonies.

Freshwater Jellyfish: Department of Environmental Service's fact sheet on freshwater jelly fish.

Video—Bladderwort: Video showing bladderwort eating. Bladderwort is a non-invasive carnivorous aquatic plant that is often misidentified as milfoil. 

Video—Bennett Cove Milfoil Removal: Video of a scuba diver using the hand-pulling method of milfoil removal in Bennett Cove. 

Video—Squam River Milfoil Removal: Video of a scuba diver using the Diver Assisted Suction Harvester to remove milfoil in the Squam River.


If you spot an aquatic invasive species in the Squam watershed please fill out a Weed Watcher Volunteer Report by clicking here or contact the Director of Conservation.