Portland, ME tide times

Portland is the largest city on the Maine coast and its harbour has been operating continuously since European settlement in the 1630s. The tidal regime here is substantial by US East Coast standards: mean spring range at the Custom House Wharf gauge runs around 3.2 metres, and neap tides still produce a 1.8-metre swing between high and low. That 3-metre variation drives the character of the waterfront entirely — at low water, the working wharves expose their full pilings, the rocky shore below the Eastern Promenade is accessible to walkers, and Casco Bay narrows to a more intimate geometry between its many islands.

The Casco Bay archipelago — Calendar Islands, so named by John Smith who counted 365 of them in 1614 (the real count is around 200) — is accessible year-round by the Casco Bay Lines ferry from the Maine State Pier on Commercial Street. Ferries serve Peaks Island (15 minutes), Little Diamond and Great Diamond Islands, Long Island, Chebeague Island, and Cliff Island. The ferry schedule is tide-independent for most crossings, but the landing ramps on the outer islands adjust with the tide, and the approaches to some island piers are depth-limited at the lowest tides.

Portland Head Light in Fort Williams Park in Cape Elizabeth, 8 kilometres south of the city, is the most visited lighthouse in New England and one of the oldest in continuous operation in the US (commissioned 1791 under President Washington). The rocky platform below the lighthouse is partially accessible at low water spring tides, though the exposed ledge is slippery and caution is warranted. The tidal current at the main shipping channel entrance to Portland Harbour runs to 2 knots on spring tides — easily observed from the Fort Williams headland.

The Portland Fish Pier on Commercial Street is the centre of Maine's commercial fishing industry, landing lobster, groundfish (haddock, cod, pollock), and scallops. The fishing vessels work Casco Bay and the deeper offshore grounds, and their schedules are timed partly around tidal state in the harbour — particularly for vessels with deeper drafts navigating the main channel.

Shore fishing from the rocks at Fort Williams Park and along the Eastern Promenade produces mackerel (jigging in summer), pollock, and striped bass on tidal transitions. The outgoing tide along the Eastern Promenade waterfront concentrates mackerel schools against the shore in June through August. Kayakers launch from the East End Beach below the Eastern Promenade and can paddle to Peaks Island in about 30 minutes in calm conditions — the crossing is tide-and-wind dependent, and the return trip against a flood current is noticeably harder than the outbound with the ebb.

The Portland Observatory on Munjoy Hill, a 26-metre signal tower built in 1807, was designed to watch for incoming ships from its hilltop vantage. The harbour below changes character dramatically with the tidal cycle — the high-water views from the observatory hill show a different city than the low-water views, with more beach and rock exposed around the islands.

Predictions on this page come from Open-Meteo Marine, a gridded global ocean model. Accuracy is typically within plus or minus 45 minutes on timing and 0.2 to 0.3 metres on height — model-derived, not from a local gauge. For authoritative US tide data, consult NOAA CO-OPS at tidesandcurrents.noaa.gov.