2023 Weekly Cyanobacteria Emails to the Community

Click on the weekly report header to access the full report and photos.

LCC 2023 Week 12 Cyano Monitoring Report

We had fewer reports during week 12 in part due to a lower incidence of blooms but also because municipal and state parks are closing and seasonal staff and volunteers are leaving the region so there are fewer monitors reporting as summer ends. However, fall blooms are not uncommon so the monitoring program will continue through October with reduced site coverage. Lower temperatures will cool the water surface and generally reduce the incidence of blooms in deeper waters like Lake Champlain’s Main Lake, but shallow water areas like Missisquoi and St. Albans Bay and Lake Carmi will be less affected and blooms may continue. 

LCC 2023 Week 11 Cyano Monitoring Report

It was another challenging week for water quality with nearly half of the 188 reports received from Lake Champlain sites chronicling blooms during week 11. Hot temperatures over the Labor Day weekend spurred cyanobacteria growth and blooms were reported in every Lake Champlain lake segment except for the South Lake. 

LCC 2023 Week 10 Cyano Monitoring Report

During week 10 of cyanobacteria monitoring over a third of the 148 Lake Champlain reports received were of blooms. Blooms were dominant again in St. Albans Bay and Missisquoi Bay but also colored waters and shoreline areas in parts of the Inland Sea, Main Lake North, and Malletts Bay. Main Lake Central, Main Lake South, and the South Lake were bloom-free. 

LCC 2023 Week 9 Cyano Monitoring Report

Blooms continued to dominate Lake Champlain monitoring reports from St. Albans Bay and Malletts Bay during week 9 and were also recorded in Missisquoi Bay, the Inland Sea, Main Lake North, and Main Lake South. Main Lake Central and the South Lake were again bloom-free but we received very few reports from the latter lake segment. 

LCC 2023 Week 8 Cyano Monitoring Report

It was another week of bloom gloom at many northern Lake Champlain sites. The majority of reports from St. Albans Bay, Missisquoi Bay, the Inland Sea, St. Albans Bay, and Malletts Bay sites were of bloom conditions. Main Lake North also had a significant number of blooms while all site reports from Main Lake Central to the South Lake were bloom-free. Some monitors reported that they witnessed the worst conditions they had ever seen in a particular lake section. You’ll find specific details from Lake Champlain and VT Inland Lake sites in this report. 

LCC 2023 Week 7 Cyano Monitoring Report

Another challenging week for St. Albans Bay with blooms dominating the reports for that section of Lake Champlain yet again. Blooms were also witnessed in Missisquoi Bay, the Inland Sea, and Main Lake North. Other sections of the big lake were bloom-free for week 7 as were the VT Inland Lakes based on the reports we received. While it is characteristic of recent trends that we see blooms concentrated in St. Albans Bay and Missisquoi Bay this time of year, be mindful that they can happen anywhere. The heavy nutrient loading from the July 2023 flooding as well as temperature and weather patterns all influence conditions. This email is a compilation of week 7 (8/6 – 8/12/23) monitoring results but three days into week 8 we have already received over 50 bloom reports from Lake Champlain sites in Missisquoi Bay, St. Albans Bay, the Inland Sea, and Malletts Bay! In some cases monitors have noted blooms extending as far out into the waters as they can see. Witnessing a cyanobacteria bloom can take an emotional toll – blooms threaten water quality, public health, recreation, the economy, and quality of life. We’re bearing witness to painful changes in our waterways. Monitoring is not the end result of the Lake Champlain Committee’s work, it’s foundational for our nutrient reduction advocacy. 

LCC 2023 Week 6 Cyano Monitoring Report

Blooms hit St. Albans Bay hard again with cyanobacteria persisting at some locations all week long or showing up off and on during the sixth week of monitoring. August and September are often prime times for bloom conditions so please continue to check conditions at least weekly and report out daily through the time blooms dissipate whenever possible. Everyone at LCC greatly appreciates your monitoring diligence and dedication!

LCC 2023 Week 5 Cyano Monitoring Report

Blooms took off during week 5 in many areas of Lake Champlain’s St. Albans Bay closing the town beach and impeding recreational use for most of the week. Blooms also showed up at several Burlington sites in Main Lake Central but didn’t persist for as long. August is historically when many locations are more susceptible to blooms and the recent heavy nutrient loading from the July 2023 floods may exacerbate this situation. Please keep your eyes on the water and use the resources and visuals in this email to help you learn how to recognize, avoid, and report cyanobacteria. Along with guidance about cyanobacteria, you’ll find photos of blooms at St. Albans Bay Park and Hathaway Point Boat Launch on Lake Champlain and Coles Pond and close ups of cyanobacteria water samples.

LCC 2023 Week 4 Cyano Monitoring Report

There were fewer blooms during week four than during the first two weeks of monitoring but we are not in the heart of bloom season yet. We also likely saw a reprieve in some areas due to the turbidity and dilution factors from the flooding. However, we are bracing ourselves for the after-effects of all the additional nutrient loading which will help feed future blooms.

LCC 2023 Week 3 Cyano Monitoring Report

Far fewer bloom reports were received during Week 3 of the cyanobacteria monitoring season. This is largely attributed to the volatile weather patterns and the increased turbidity from the flooding that affected much of Lake Champlain as well as Vermont inland waterways. The heavy sediment load carried by a high volume of water had a combined effect of limiting light necessary for bloom growth and diluting existing cyanobacteria. However, flooded tributaries also sent high levels of nutrients to Lake Champlain and other waterways. Early estimations are that some tributaries delivered more phosphorus to Lake Champlain during the July 2023 floods than during all of 2022! This will likely fuel blooms later in the season.

LCC 2023 Week 2 Cyano Monitoring Report

Week 2 of cyanobacteria monitoring began with another spate of bloom reports and ended with catastrophic flooding which has devastated communities in the Lake Champlain watershed and throughout the state of Vermont. We hope you are safe, healthy, and dry—and that you’ve made it through the storms (which aren’t over) without damage. While Lake Champlain is below flood stage, it is receiving a heavy load of debris, nutrients, sediment, and a stormwater swill of oil and other pollutants from swollen tributaries, wastewater overflows, and failed septic systems.

LCC 2023 Week 1 Cyano Monitoring Report

Thank you for signing up to receive the Lake Champlain Committee (LCC) Cyanobacteria monitoring reports! Monitoring began the week of June 25 and will run through early fall. Each week we’ll send you an update about conditions monitors are finding on Lake Champlain and at many inland lakes. This week’s report covers conditions from Sunday, June 25 through Saturday, July 1, 2023. If you’d like to learn more about cyanobacteria or join our monitoring team please sign up here. We will hold training sessions on Wednesday July 12 from 9:00 a.m. until Noon and 5:30 to 8:30 p.m.