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

Current Conditions

Check Conditions Using our Interactive Map

June 26, 2015

Algae conditions are good around Lake Champlain, Lake Iroquois, Lake Carmi, and Lake Memphremagog. We have had no reports of blooms this week.

Conditions can continuously change through the season. Be alert for and avoid contact with blue-green algae blooms and accumulations.

Check out our Blue-green Algae Photo Gallery, so you can recognize cyanobacteria and avoid them.  Our interactive Algae Tracker Map is a good source of information about current conditions, and is mobile-friendly so you can access the information you need while at the lake. Thanks to the Lake Champlain Committee staff and citizen volunteers for another season of support.Other Bodies of Water
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.Return to Top

Lake Conditions Interactive Map

The tracking map reflects conditions and data as of the date of report. Test site observations and samples are collected once each week. Current lake conditions may change. If you see blue-green algae, don't go in the water. Lake condition reports and interactive map updates for the 2015 season will resume at the end of June 2015.Map and Season Summary Archive: 2014 | 2013 | 2012The 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 when we sampled. These areas should be safe for recreational uses.Low Alert - yellow
These shoreline areas have blue-green algae that produce toxins, but toxin concentrations are currently below levels of concern. 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, and toxin concentrations are above levels of concern. The water is not safe for recreational use in areas that contain scums. Please see Department of Health information about beach closings and hazardous areas.
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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