Island Logistics on Casco Bay: What the Ferry Actually Controls on Long, Chebeague, Great Diamond, Little Diamond, and Cliff Island

One Ferry Carrier for Four Islands, a Second Operator Just for Chebeague

Casco Bay Lines, operated by the Casco Bay Island Transit District, is the shared passenger and freight carrier serving all five of these islands from downtown Portland -- the same carrier that also serves Peaks Island, since this is genuinely shared infrastructure across the whole bay rather than any one island's exclusive service. For Long Island, Great Diamond Island, Little Diamond Island, and Cliff Island, Casco Bay Lines is the only regular ferry connection to the mainland.

Chebeague Island is the one genuine exception, and it's worth stating plainly because it's structurally different from every other island in this group: Chebeague is served by two separate operators running two separate routes. Casco Bay Lines runs a longer, roughly 60-to-90-minute mail-boat route from downtown Portland to Chebeague's Chandler's Cove wharf. Separately, the Chebeague Transportation Company (CTC) runs a much shorter, roughly 15-minute passenger crossing from Cousins Island in Yarmouth to the island's own Stone Wharf, plus a 43-foot vehicle and freight barge that operates April through November, by reservation. No other island in this group has a second carrier or a second route -- for Long Island, Great Diamond, Little Diamond, and Cliff Island, Casco Bay Lines is it.

Island by Island: How Long the Crossing Actually Is

Long Island's Casco Bay Lines passenger service typically runs 30 minutes to an hour, depending on the specific route and stops. Long Island is also the only island in this group with its own vehicle ferry -- a car and freight barge that runs by reservation, with no fixed published schedule, rather than as a standing timetable service.

Great Diamond Island is served by a Casco Bay Lines stop at Diamond Cove, on the island's northeastern side. Little Diamond Island is likewise served by Casco Bay Lines. Neither island's specific crossing time was independently confirmed in the research behind this page, and this page won't invent one -- confirm current run times directly with the carrier.

Cliff Island is the farthest and longest run of the five, commonly cited at roughly 60 to 120 minutes one way depending on route and freight stops -- a wide range because it depends heavily on how many other stops a given boat makes along the way. Five daily round trips operate year-round, with seasonal schedule variation. Cliff Island has its own ZIP code, 04019, and a barge ramp added in 2008 specifically to support freight delivery to an island with no other way to receive bulk goods.

Water and Roads: Two Physical Limits That Aren't About the Ferry at All

Two of these islands have a second logistics constraint that has nothing to do with boat schedules. Little Diamond Island's water supply is shut off in winter -- a real, physical limit on year-round habitation, not a policy choice, and a major reason the island's year-round population is as small as it is. Anyone considering Little Diamond as a full-time home needs to understand that winter water access is not guaranteed the way it would be on the mainland or on a larger island in this group.

Cliff Island's constraint is different: it's the only year-round-inhabited island in Casco Bay with entirely unpaved roads. Residents get around by walking, bicycle, and golf cart rather than by car -- there simply isn't a paved road network to drive on. That reshapes ordinary daily logistics on top of the ferry schedule itself: getting groceries, kids, or a delivery from the dock to a house on Cliff Island is a walking, biking, or golf-cart trip, not a driving one.

Daily Life Runs Through the Boat Schedule, Not a Road

On a mainland Maine coastal town, groceries, mail, medical trips, school runs, and emergency response are road logistics with a boat as a backup for the rare occasion. On these five islands, it's the reverse: groceries, mail, medical care, school access, and emergency response for every one of them run through a Casco Bay Lines timetable (and, for Chebeague, also the Chebeague Transportation Company's schedule) as the default, everyday mechanism -- a genuinely different daily-living structure than any bridge-connected market on this site.

School access is a concrete, documented example of that structure. Chebeague Island and Cliff Island each maintain their own small on-island elementary school, but on both islands, students in 6th grade and above commute daily, by ferry, to mainland Portland-area schools -- protecting that on-island elementary school was explicitly cited as a driving motivation behind Chebeague's own 2007 secession from the town of Cumberland. Long Island maintains its own Long Island School as well. Great Diamond Island and Little Diamond Island, given their small and heavily seasonal populations, were not found to have a dedicated on-island school of their own.

This page won't invent a specific ferry-based emergency-response time, a mail delivery schedule, or a grocery-run frequency for any of these islands -- none of that level of operational detail was independently confirmed in the research behind this page. What can be said honestly is the structural point: on Long Island, Chebeague, Great Diamond, Little Diamond, and Cliff Island, a boat schedule sits between daily life and the mainland in a way it simply doesn't for a road-connected town, and that's worth weighing seriously before buying or relocating, independent of any specific number.

The Live 2026 Fare Fight -- Why Ferry Costs Are an Open Question Right Now

Because every one of these islands' logistics runs through Casco Bay Lines, a 2026 dispute over the carrier's own fares is directly relevant to anyone thinking about living on one of them. Casco Bay Lines proposed raising peak-season round-trip adult passenger fares from $14 to $17, with 30-day passes rising from $48 to $51 and off-peak daily fares from $7.20 to $8 -- the second passenger fare increase in three years, following a 2024 hike and a separate 2025 vehicle-fare increase. The transit district cited rising fuel, labor, vessel-maintenance, insurance, and regulatory costs.

Island residents pushed back. Hundreds filed a formal petition citing both affordability concerns and improper public notice of the proposed increase, and Maine's Office of the Public Advocate backed a state review, saying repeated fare increases had placed a growing financial burden on low- and moderate-income island households. On June 16, 2026, the Maine Public Utilities Commission unanimously voted to open a full, formal investigation into both the financial justification for the increases and the rate-setting process itself. As of that vote, the new fares remained in effect for the summer season while the investigation proceeded, with the PUC retaining authority to modify or reverse them.

Separately, Casco Bay Lines' own current rates page lists a $16.00 peak-season round-trip adult fare and an $8.00 off-peak round-trip adult fare -- flat rates that apply identically across all seven stops the carrier serves (Peaks, Little Diamond, Great Diamond, Diamond Cove, Long, Chebeague, and Cliff), regardless of distance or crossing time. That means the roughly two-hour round trip to Cliff Island costs the same as the short hop to Peaks Island. The $16 figure on the carrier's own site doesn't exactly match the $17 figure discussed in the proposal coverage -- this page treats the carrier's own current rates page as the more authoritative figure, but notes the discrepancy rather than picking a number to state as settled. Anyone budgeting for regular ferry travel to any of these islands should verify current fares directly with Casco Bay Lines, and watch for the outcome of the PUC investigation, since it could change future rates either way.

What This Means Before You Decide

Put together, honestly: these five islands share one dominant logistics fact, not five separate ones -- everything that would be a road errand on the mainland is a ferry-schedule errand here, run through Casco Bay Lines for Long Island, Great Diamond, Little Diamond, and Cliff Island, and through both Casco Bay Lines and the Chebeague Transportation Company for Chebeague. Layer on top of that two island-specific physical limits worth taking seriously: Little Diamond's winter water shutoff, which caps who can actually live there year-round, and Cliff Island's entirely unpaved road network, which means no car, only walking, bicycle, and golf cart. And layer on top of that a live, unresolved 2026 dispute over what the ferry itself will cost going forward, now under formal Maine Public Utilities Commission investigation.

None of this is medical, legal, or relocation advice, and nothing here should be read as a current ferry schedule, fare, or emergency-response guarantee. Verify current schedules and fares directly with Casco Bay Lines and, for Chebeague, the Chebeague Transportation Company as well; confirm water service, road access, and school logistics directly with each town or the City of Portland before making a purchase or relocation decision. Readers whose interest is specifically Peaks Island should use this site's own dedicated Peaks Island logistics page, which covers that island's shorter commuter-ferry crossing and its own governance structure in depth.