Home » Science: We help you see what is going on beneath the surface of the Bay

Science: We help you see what is going on beneath the surface of the Bay

Before we started monitoring the water quality of Casco Bay, no one knew how healthy or polluted the Bay actually was. Thanks to the data we have been collecting at dozens of shoreside and offshore sites, we can state that the water temperature of Casco Bay has risen by 2.5°F, on average, since 1993.

Our long-term data set is enhanced by our Continuous Monitoring Station that has been monitoring the health of the Bay hourly, 365 days a year, since 2016. Anchored below a pier in Yarmouth, it provides the frequent, high-volume stream of data necessary to accurately track changes that may impact the oysters, clams, lobsters, and eelgrass within the Bay.

“Climate change is happening so rapidly, we needed to add to the way we collect data,” observed Research Associate Mike Doan. Since July 20, 2016, our Continuous Monitoring Station has been gathering data around the clock, all year long. Each month, we post information on 10 measures that document water quality at our monitoring site in Yarmouth, near the coastal midpoint of Casco Bay. 

Our Monitoring Station is fondly nicknamed the “Cage of Science” because its high-tech sensors are housed inside a converted lobster trap. These instruments measure temperature, salinity, oxygen, pH, carbon dioxide, and more.

These data help us gain new insights—and new questions–on the health of the Bay. Others are finding these data useful, too. Scientists use our data to inform their own research. Policy makers refer to our data to support legislative action on climate change. Classroom teachers have their students analyze our data to launch discussions on what humans can do to improve water quality. Recently, we discovered that young visitors to the Children’s Museum & Theatre of Maine measure the temperature and salinity of the Museum’s touch tank and compare their readings to our real-world data on Casco Bay.

We have posted our data online for all to see. Visit cascobay.org to see for yourself how Casco Bay is changing month by month.

The news media have recently reported on our plan to expand our array of Continuous Monitoring Stations to get a better understanding of the dynamics of Casco Bay:

Our Top 10 Moments of 2023

December 21, 2023

As this year comes to an end, let’s reflect and celebrate the many ways that we worked together to protect the health of Casco Bay in 2023. Here are our top ten stories of the year: 1) We won a four-year moratorium on new sources of pollution into the lower Presumpscot River. The… Read more

Ever-Changing Casco Bay

December 8, 2023

Casco Bay is ever–changing. The Bay changes with each tide, each day, and each season. And now, because of climate change, our coastal waters are transforming in different ways and faster than we thought possible. At our Ever–Changing Casco Bay event on November 28, Staff Scientist Mike Doan dove into the data we use to track… Read more

How we are moving science forward

November 14, 2023

Sensor Squad Moves Science Forward Good decisions are made using good data. That’s the idea behind the Maine Ocean Climate Collaborative. “The Collaborative is made up of some of the best saltwater scientists in Maine,” says Casco Baykeeper Ivy Frignoca. “By sharing research and knowledge of climate change science, water… Read more

Join us! Stormwater impacts and water sampling

August 30, 2023

Want to know how heavy rainfalls, like those we have experienced this summer, impact Casco Bay? Join Friends of Casco Bay staff in South Portland on September 8 at 10 a.m. to learn about the impacts of stormwater on our local waters using both observational and scientific data. What: Stormwater Impacts and Water… Read more

31 Years of Seasonal Sampling

June 8, 2023

Today, on World Ocean Day, we are celebrating our 31st year of collecting seasonal water quality data on the health of Casco Bay! It also happens to be Casco Baykeeper Ivy Frignoca’s birthday – Happy Birthday, Ivy! Every year, from May to October, Ivy and Staff Scientist Mike Doan take… Read more

The Maine Ocean Climate Collaborative Provides a Model to Move Maine Forward

May 11, 2023

Studying changing coastal ecosystems comes with unique challenges – Friends of Casco Bay and our partners are taking them on. Friends of Casco Bay is facilitating the newly formed Maine Ocean Climate Collaborative, a coalition of scientists and marine organizations from the University of New Hampshire to the border of… Read more