U.S. Route 1 in Maine

U.S. Route 1
Route of US 1 in Maine highlighted in red
Route information
Maintained by MaineDOT
Length:	527 mi (848 km)
Existed:	1926 – present
Major junctions
South end:	US 1 in Portsmouth, NH
	I‑95 / Maine Turnpike in Kittery I‑195 in Saco I‑295 at the Portland-Yarmouth line US 302 / SR 100 in Portland I‑495 in Falmouth US 201 in Brunswick SR 9 in Calais US 2 in Houlton I‑95 / Maine Turnpike in Houlton SR 161 in Caribou
North end:	Route 161 in Clair, NB
Location
Counties:	York, Cumberland, Sagadahoc, Lincoln, Knox, Waldo, Hancock, Washington, Aroostook
Highway system
United States Numbered Highway System List Special Divided Replaced Maine State Highway System Interstate U.S. State ← I‑495 US 1A → ← Route 20 N.E. Route 25 →

In the U.S. state of Maine, U.S. Route 1 (US 1) is a major north–south state highway serving the eastern part of the state. It parallels the Atlantic Ocean from New Hampshire north through Portland, Brunswick, and Belfast to Calais, and then the St. Croix River and the rest of the Canada–US border via Houlton to Fort Kent. The portion along the ocean, known as the Coastal Route, provides a scenic alternate to Interstate 95.

Route 1 enters Maine from New Hampshire by bridging the Piscataqua River at Kittery on the Memorial Bridge. However, this bridge was abruptly closed in July 2011 due to structural defects with a new bridge planned to replace it. That new bridge opened in the summer of 2013. Following the sandy southern Maine coast, the highway bridges the Cape Neddick River in Cape Neddick, Josias River and Ogunquit River in Ogunquit, the Webhannet River in Wells, and Merriland River, Mousam River and Kennebunk River in Kennebunk. After bridging the Saco River between Biddeford and Saco the highway bridges the Nonesuch River in Scarborough.