Casco Bay Mail Boat Tours

Casco Bay Lines has carried mail, groceries, and islanders across nine miles of open water since 1845, making it the oldest continuously operating ferry service in the United States. The mail boat departs Commercial Street six times daily, stopping at Peaks, Little Diamond, Great Diamond, Long, Chebeague, and Cliff islands in a choreographed sequence unchanged for decades. Crew members unload pallets of provisions, hand-sort parcels by address, and greet residents by name — a ritual that transforms a public ferry into a lifeline for year-round island communities. Unlike the sunset cruises and lighthouse charters that cater to tourists, Casco Bay Mail Boat Tours preserve the utilitarian rhythm of Maine's working waterfront. The Machigonne II and Bay Mist — steel-hulled vessels built for cargo and weather — carry construction materials, propane tanks, and restaurant deliveries alongside passengers who treat the crossing as commute rather than spectacle. Visitors share bench seating with fishermen, schoolchildren, and grocers, watching deckands secure lobster traps and refrigerated goods with practiced efficiency. The route threads between granite ledges and spruce-crowned islands, passing Fort Gorges and Ram Island Light without narration or fanfare. The mail boat schedule operates from 5am to near midnight, synchronized with tides and island needs rather than visitor convenience. The two-and-three-quarter-hour Mailboat Run — departing mid-morning and mid-afternoon — circles all six stops, allowing passengers to remain aboard for the full loop or disembark to explore Peaks Island's beaches and return on a later ferry. Chebeague Island, the farthest terminus, lies fifty minutes offshore; Long Island retains a one-room schoolhouse and dirt roads. Weather permutes the timetable: fog delays, winter ice, and northeast gales force cancellations that strand islanders and freight alike. Casco Bay's 365 Calendar Islands — a geologic exaggeration, the true count is closer to 140 — form a granite archipelago scoured by glaciers twelve thousand years ago. The mail boat crosses routes used by Wabanaki fishermen, colonial traders, and Prohibition rum-runners. Fort Gorges, a Civil War-era granite citadel on Hog Island Ledge, rises three stories from the water yet never fired a shot. The Casco Bay island community swells from 3,000 year-round residents to over 10,000 each summer, straining the ferry system that remains their sole grocery, pharmacy, and postal link to the mainland.