Lake Conditions and Blue-green Algae Bloom Updates

Cyanobacteria, also referred to as blue-green algae, are a common and natural component of the microscopic plants (plankton) in Lake Champlain.

Some types of blue-green algae produce natural toxins or poisons. When these algae die and break down, toxins can be released into the water. Learn more: Facts about Blue-green Algae

Lake Conditions

Check our Interactive Map for current reported conditions.

People and pets should stay away from blooms. To find out if a beach or swim area is open: Contact whomever is responsible for maintaining the beach. This may be the town, a private association, or Vermont State Parks.

Weekly Summary:  August 21, 2015


Vermont Inland Lakes

New York Lake Champlain conditions: Good conditions reported. There have been no reports of blooms.

Other Bodies of Water

Our interactive Algae Tracker Map is a good source of information about current conditions, and is mobile-friendly. Thanks to the Lake Champlain Committee staff and citizen volunteers for another season of support.

Not all Vermont bays, lakes, and ponds are monitored. Be aware of changing conditions, and keep out of the water if you think blue-green algae may be present.

Thank you to all the volunteer monitors. Updates and data are provided in cooperation with the Department of Environmental Conservation Watershed Management Division and the Lake Champlain Committee.

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Lake Conditions Interactive Map

The tracking map provides condition information and data as of the date of report. Test site observations and samples are collected once each week. Conditions can and do change. If you see blue-green algae, don't go in the water.

Map and Season Summary Archive: 2014 | 2013 | 2012

The interactive Lake Champlain status map brings together in one place environmental and public health surveillance data about Blue-green algae. The map is a data collaboration project of the Departments of Health and Environmental Conservation.

For more information:
Tel: 1-800-439-8550
Email: Environmental Health Division.

Alert Levels

The interactive map color codes correspond with alert levels.

Generally Safe - green
No toxic blue-green algae blooms were present along these shoreline areas. These areas should be safe for recreational uses.

Low Alert - yellow
These shoreline areas have blue-green algae at levels below bloom conditions. If toxin testing was conducted, toxin concentrations are below levels of concern for recreational use. These areas are open for recreation, but caution is advised in any areas where dense accumulations or scums are apparent.

High Alert - red
These shorelines have blue-green algae in dense scums at least in some areas. If toxin testing was conducted, toxin concentrations are at or above levels of concern for recreational use. The water is not safe for recreational use in areas that contain scums.

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Watch for and Avoid Blooms

Wind and waves can move algae around. Blooms can appear or disappear very rapidly, so conditions around the lake are likely to change over the course of the week. As always, watch for and avoid blue-green algae blooms. Report Suspected Algae Blooms Return to Top