MileCheck

Maine drawbridge map — Casco Bay and the coast

The Casco Bay Bridge between Portland and South Portland is Maine’s drawbridge that matters — its openings stop Route 77 commuters cold, and MaineDOT runs an alert channel for it. This page also watches our live Maine feed for bridge events. Coastal swings (Southport, South Bristol) open on demand.

Bridge event active (live from the ME feed)
Movable bridge — tap for its opening rules
All Maine movable bridges

Get drawbridge + road alerts in the app

MileCheck shows live DOT alerts, mile markers, and bridges on the road — in all 50 states, with CarPlay and Android Auto.

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How it works: opening rules per 33 CFR 117. MaineDOT publishes Casco Bay Bridge alerts through New England 511 — the same feed MileCheck ingests — so this page checks the live Maine feed for bridge events every 2 minutes. Sign up for MaineDOT’s own alerts at maine.gov/mdot/alerts. Also see Seattle and the other state pages on the Maps hub.