Status of Blue Green Algae on Lake Champlain - Updated Weekly
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Weekly Status
Activity level will be updated regularly, and weekly when there is a change in status.
Status Update: September 5, 2008
Most areas of Lake Champlain are generally safe; however, there are significant blue-green algae blooms present in Missisquoi Bay, St. Albans Bay, and a few other locations in Alburgh Passage, around the Champlain Islands and in Shelburne Bay.
In Missisquoi Bay, the bloom is widespread throughout most of the bay, but greatest accumulations are currently present in the eastern (Highgate) side of the bay, along the Shipyard and High Rocks shorelines. Toxin concentrations have reached high alert levels in some patches on this side of the bay. Extreme caution is advised in these areas.
In St. Albans Bay, the bloom is apparent along the north shore of the
bay, near the boat launch. Significant accumulations are also present
in Alburgh Passage and along the Grand Isle shoreline just north of the
ferry landing on the Main Lake. Toxin concentrations in these locations
are at the low alert level. Caution is also advised in these areas.
A small bloom is also present along the Shelburne Bay shoreline at around Red Rocks Park. Toxin concentrations at this location are at the low alert level.
The areas of densest algae accumulation in the northern lake will be
moving around with the changing winds and weather fronts, so those
recreating in Missisquoi Bay, other areas in the northern part of the
lake, and in Shelburne Bay should watch for dense accumulations of algae
and avoid these locations.
Alert Level Descriptions
Below is a map of Lake Champlain which displays areas where blooms are present during the season. The color-coded map illustrates the following alert levels:
- Generally safe (white) - 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 (light green) - 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 (dark green) - 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.
Status Map
