Friends of Casco Bay

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Friends of Casco Bay Friends of Casco Bay is a marine stewardship organization founded in 1989 to improve and protect the environmental health of Casco Bay.

We are a founding member of , a global movement of more than 300 Waterkeeper groups around the world.

What does seasonal sampling look like?From May through October, our science team heads out on Casco Bay to collect measu...
10/12/2026

What does seasonal sampling look like?

From May through October, our science team heads out on Casco Bay to collect measurements that help us understand the health of the water. They measure dissolved oxygen, pH, temperature, salinity, and more, building a long-term record of changing conditions in the Bay.

It’s hands-on, careful work. And while the numbers are what make it into our databases and reports, there are people behind every measurement.

We recently brought a photographer out on the water to capture some of that work. On this quiet early fall morning, the Bay was gray and calm, with just a hint of color along the shore.

Here’s a glimpse of the people, tools, and water behind the data.

We brought a photographer along to document the work, and our Communications Coordinator couldn’t resist bringing her camera, too.

📸Photos by the incredible Kevin Morris Photographer.

An update on the Karenia mikimotoi bloom in Casco Bay: For over a month now, we’ve been monitoring a bloom of Karenia mi...
10/10/2026

An update on the Karenia mikimotoi bloom in Casco Bay: For over a month now, we’ve been monitoring a bloom of Karenia mikimotoi, a naturally occurring marine phytoplankton, in Casco Bay and along the Maine coast. The dense blooms we saw through September discolored the water, lowered dissolved oxygen levels, and caused die-offs of marine organisms, particularly soft-shell clams and marine worms.

In Casco Bay, the bloom is still present but appears to be dissipating. The Maine Department of Marine Resources reports that Karenia cell counts are declining in inner Casco Bay, although some areas continue to have very low oxygen. We are still seeing massive shellfish die-offs.

Last week, Casco Baykeeper Ivy Frignoca surveyed Maquoit Bay in Brunswick by airboat and found white bacterial mats and extensive soft-shell clam die-offs. Meanwhile, Mike Doan has been keeping an eye on pH and dissolved oxygen levels, both of which are still low.

It is important to note that Karenia mikimotoi is not considered a threat to human health. DMR says it remains safe to eat shellfish and fish harvested from Maine waters.

Maquoit Bay and the eastern side of Middle Bay remain closed to shellfish harvesting, due to concerns of additional stress on the shellfish.

Our science team will continue monitoring conditions and plans to collect sediment samples to learn more about what is happening below the surface.

You can follow updates on the Karenia bloom on Maine DMR’s website: https://www.maine.gov/dmr/news/wed-09232026-1200-dmr-updates-karenia-mikimotoi-bloom

📸Photos of Maquoit Bay on 9/29 and 10/1 by Ivy Frignoca and Glenn Michaels.

Last week, we joined the Casco Bay Estuary Partnership for the State of Casco Bay, a celebration of the science, people,...
10/08/2026

Last week, we joined the Casco Bay Estuary Partnership for the State of Casco Bay, a celebration of the science, people, and programs working to understand and protect this incredible place.

And we got a pretty wonderful shoutout. Curtis Bohlen, Director of the Casco Bay Estuary Partnership, highlighted Friends of Casco Bay’s contribution to their State of Casco Bay report. Lately, we've been contributing around a million data points a year to the report! 🤯 That’s a whole lot of water monitoring.

Casco Baykeeper Ivy Frignoca also took the stage as a presenter and panelist, sharing what we’ve learned through our decade-long partnership with the Maine Ocean Climate Collaborative to advance ocean climate science and policy.

We loved seeing students in the audience asking thoughtful questions. One even asked about stormwater! 👏

Our team also joined a lively poster session, sharing our Seagrass Snapshot and our PFAS research with Bigelow Laboratory for Ocean Sciences. And there was plenty more to enjoy: music, oyster shucking, and a Multimedia Dance Theater performance inspired by Casco Bay and the efforts to support its long-term vitality.

It was a great reminder that the “state” of Casco Bay is shaped by all of us: scientists, students, researchers, community members, and organizations working together to understand, celebrate, and care for these waters. 💙

🌅For more than 13,000 years, the Wabanaki have maintained deep relationships with the lands, waters, and beings of "Dawn...
10/07/2026

🌅For more than 13,000 years, the Wabanaki have maintained deep relationships with the lands, waters, and beings of "Dawnland," their home, a place marked as “Maine” on most maps, and with Casco Bay specifically. The Abenaki called the Bay Aucocisco, meaning “place of herons” or “marshy place.” Many places around the Bay still carry Wabanaki names: Chebeague means “isle of many springs,” Maquoit Bay means “bear place,” and Presumpscot means “many rough places,” referring to its waterfalls.

The Wabanaki are the original stewards of this place. They spoke up for rivers, fish, and clean water as colonists built dams and industry polluted rivers. Wabanaki people continue to advocate for the land, water, and their relationship to both.

Since European settlers arrived and Maine became a state, Wabanaki people have lost access to most of their land and waters, as well as the ability to sustain themselves in traditional ways. For more than 40 years, the State of Maine has also restricted their inherent sovereignty, despite federal recognition of Wabanaki sovereignty.

💦 At Friends of Casco Bay, we know that healthy waters depend on long-term, place-based relationships with land and water. The Maliseet, Mi’kmaq, Passamaquoddy, and Penobscot have maintained those relationships since time immemorial. Respecting Wabanaki sovereignty is part of our work to protect Casco Bay and its watershed. It is also an opportunity to build a more collaborative and resilient future for everyone who depends on these waters.

This Indigenous Peoples Day, learn more about Wabanaki history, sovereignty, and the ongoing work of the Wabanaki Nations. The Wabanaki Alliance Indigenous Peoples Day celebration in Augusta on Monday, October 12, is an opportunity to listen, learn, and show support.

Learn more about Wabanaki sovereignty and the celebration: https://www.cascobay.org/standing-with-wabanaki-tribes/

🌱 What did we find during this summer’s Seagrass Snapshot? Back in July, 80 Water Reporters explored shallow waters and ...
09/30/2026

🌱 What did we find during this summer’s Seagrass Snapshot? Back in July, 80 Water Reporters explored shallow waters and mudflats across Casco Bay, documenting where eelgrass is growing and how healthy the beds appear. Now, we have the results!

Here are three places that stood out:
📍 Cape Elizabeth: Water Reporters found a small patch of eelgrass at Pond Cove that had never been documented before, along with a larger, patchy bed at Trundy Point that appears to be thriving.
📍 Maquoit Bay: After years of eelgrass loss and several Snapshot surveys without a confirmed sighting, Water Reporters found rooted eelgrass at multiple sites, including young shoots near Flying Point and a larger meadow off Little Flying Point.
📍 New Meadows River: A checkup of this less-documented area revealed patches of dense, long eelgrass near Cleveland Island, with some differences in growth between the north and south sides.

These findings are encouraging, but they also raise new questions. In 2027, the Maine DEP will map Casco Bay’s eelgrass for the first time since 2022, giving us an important look at how these meadows have changed over five years.

Read the full story to explore what Water Reporters found and why these discoveries matter. https://www.cascobay.org/2026-seagrass-snapshot-report/

On September 27, 1996, the Julie N tanker collided with Portland's Million-Dollar Bridge, spilling more than 179,000 gal...
09/28/2026

On September 27, 1996, the Julie N tanker collided with Portland's Million-Dollar Bridge, spilling more than 179,000 gallons of oil into Casco Bay and the Fore River. Cheryl Seavy, our Associate Director at the time, was on the Million Dollar Bridge the moment it was hit.

Our staff was on the scene within 20 minutes of the incident. Casco Baykeeper Joe Payne and Volunteer Coordinator Peter Milholland quickly got into our pumpout boat to check it out. At the scene of the spill, Peter was transferred to a spill response boat and assisted in placing the first boom across the harbor.

The cleanup was coordinated by Amity Product Carriers, the owner of the vessel and “the responsible party.” Much of the cleanup was performed by Seacoast Ocean Services, Marine Spill Response Corporation, as well as other licensed response companies.

Joe joined the joint incident command, which included the Coast Guard, NOAA, EPA, and state officials from the Maine Department of Environmental Protection (DEP). Knowing the Bay intimately and being trained in oil spill preparedness, Joe made numerous recommendations during the cleanup that helped contribute to its success.

Out on the water, Joe saw a gap in the booms that helped prevent even more untold amounts of oil from getting out into the Fore River. Cleanup crews were working around the clock, and by the end of the second day, efforts were slowing. Joe strongly urged that more needed to be done. The Coast Guard, DEP, and the responsible party brought in many more people and boats for the cleanup. Edward Sullivan, the Maine Department of Environmental Protection Commissioner at the time, said, "The Casco Baykeeper doggedly pushed the responders to shore up weak spots in the oil recovery effort."

13.8 miles of coastline were covered in oil, with the upper Fore River marsh heavily affected. The impact to birds was devastating. Friends of Casco Bay contacted 100 trained oiled-bird rehabilitation volunteers to assist Maine Inland Fisheries & Wildlife with oiled bird recovery. We also coordinated volunteers to be on the lookout for oiled wildlife. 1,500 oiled birds were spotted (it was migration season), but only 27 were captured, and most of those died.

In the end, 78% of the oil was cleaned up, an amount considered exceptionally successful. (15-20% is considered a typical oil recovery success.)

After the spill, Joe remarked in an interview, “Casco Bay is a living, breathing organism full of clams, periwinkles, seaweed and lobsters. The Bay brings so much to us, and here it was suffocating. It made me physically sick to my stomach to see the insult.”

We look back at this event with a mixture of pride at our efforts, sadness at the devastation it caused, and caution for how such tragic environmental disasters can be prevented in the future.

Join us for our last public cleanup of the season.  We will provide everything you need to help out, including gloves, b...
09/22/2026

Join us for our last public cleanup of the season. We will provide everything you need to help out, including gloves, bags, and trash grabbers!

Back Cove Cleanup
Friday, September 25
10:30 am to 12:00 pm
Meet at Back Cove Trail Parking Lot

Registration is recommended so we know how many to expect.
👉🏿cascobay.org/cleanup-series/

💦Good news for Casco Bay and waters across Maine:💦 Maine’s Superior Court has upheld a key requirement in the state’s fe...
09/21/2026

💦Good news for Casco Bay and waters across Maine:💦 Maine’s Superior Court has upheld a key requirement in the state’s federal stormwater permit. The ruling means municipalities covered by the permit must adopt ordinances requiring low impact development (LID) techniques.

LID helps protect the natural flow and filtration of water as land is developed. In these photos, you can see LID in action: a rain garden, a natural buffer of trees beside a river, and permeable pavement. These features give rain and snowmelt a place to naturally filter into the ground, reducing pollution and water quality problems.

The Municipal Separate Storm Sewer, or “MS4,” permit is required under the federal Clean Water Act and applies to 30 Maine municipalities, including 13 in the Casco Bay watershed.

Friends of Casco Bay has advocated for the LID requirement for years. When the City of Lewiston challenged it in court, we filed an *amicus*, or “friend of the court,” brief supporting the requirement.

👩‍⚖️The Superior Court upheld the requirement in August. Lewiston had 30 days to appeal but did not do so. The LID requirement is now final and will be implemented by regulated municipalities.

“Stormwater pollution is notoriously difficult to treat and regulate. The best way to address it is to prevent it,” says Casco Baykeeper Ivy Frignoca. “If we cluster housing to conserve natural buffers along waterways and preserve vegetation that filters rainwater, we can continue to grow our communities while helping protect the waters we love and depend upon.”

📖 Read the full story here: https://www.cascobay.org/court-upholds-maines-stormwater-protections/

📸Photos by Meghan Vigeant and Virginia Sambuco.

For the past few weeks, we’ve been monitoring a large algal bloom in Casco Bay. The bloom contains Karenia Mikimotoi. Wh...
09/17/2026

For the past few weeks, we’ve been monitoring a large algal bloom in Casco Bay. The bloom contains Karenia Mikimotoi. While it is not a threat to human health, it has had toxic effects on marine animals and reduced oxygen levels in the Bay.

You might notice it by the brown color in the water, the dead clams surfacing from the mud, or the noxious smell might be enough to tip you off.

Our Community Organizer Sara Freshley recently visited Maquoit Bay with Water Reporter Matt Corbett, and they found thousands of dead clams, as well as dead eel, bloodworms, and horseshoe crabs.

“It smells really bad,” Sara said.

Satellite images show a massive bloom from Cape Cod to Penobscot Bay. Here in Casco Bay, the bloom seems thickest in eastern Casco Bay, impacting clam flats in Maquoit Bay and Middle Bay.

Our staff have been out on the Bay gathering data and documentation, hearing from clammers and fishermen, meeting with marine resource managers, scientists, and state and municipal partners. This week, we deployed several Water Reporter volunteers to help document the bloom, particularly in Harpswell and Brunswick.

Good and Bad news: The Maine Department of Marine Resources (DMR) is also monitoring this bloom, and reported on Wednesday that cell counts have been trending downward. Our data shows a similar trend in phytoplankton abundance. A weakened bloom is good news, but its aftermath will continue lowering oxygen levels and causing more die-offs.

This bloom is certainly a concern for clammers, fishermen, and aquaculturists in Casco Bay. Our hearts and thoughts go out to them.

As we continue to monitor conditions, we are also working to understand the possible causes of this massive bloom. We’re committed to looking at the data and asking questions—it’s a process! So, please stay tuned as we learn more and can share more details and data over the next few weeks.

📷Photos of brown water from the Karenia bloom in Great Island Boat Yard by Sandy Paige. Photos of the bloom and clam die-offs in Maquiot Bay by Dan Devereaux and Sara Freshley. Photos of our staff on the boat by Susan Bosco.

Monday’s Freshwater Finds brought about 20 people together with Friends of Casco Bay and  to explore, learn, and talk ab...
08/14/2026

Monday’s Freshwater Finds brought about 20 people together with Friends of Casco Bay and to explore, learn, and talk about the freshwater systems around us. 💧🌿

We dug into topics including stormwater pollution, water quality monitoring, invasive species, trail maintenance, and the science and conservation work happening throughout the Presumpscot region.

A big thank-you to the folks with Presumpscot Regional Land Trust--Toby, Clara, Abby-- who shared their knowledge and helped make the afternoon such a great learning experience. We loved getting to know more about PRLT’s work—and we’re grateful for the chance to learn together!

Even the rain couldn’t stop us. ☔ We just moved to the rain date!

Address

75 West Commercial Street, Suite 301
Portland, ME
04101

Opening Hours

Monday 8:30am - 5pm
Tuesday 8:30am - 5pm
Wednesday 8:30am - 5pm
Thursday 8:30am - 5pm
Friday 8:30am - 5pm

Telephone

+12077998574

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