{1} The Maine Ex-Highway Index
U.S. Highway 1

toll bridge (name unknown), from NH border
Old Post Rd, Kittery
Badgers Island bridge to Kittery mainland existed in 1918. 1
Memorial Bridge from Badgers Island to Portsmouth NH opened 1923-08-17. 7
State Rd not yet built in 19201; presumably this was concurrent with the Memorial Bridge.
This routing thus predates U.S. Route 1, but was quite likely part of New England Route 1.

Pine Hill Rd, York
Shore Rd, Ogunquit
State Rd was there as early as 1893 1

Bayley Rd, Wells
Post Rd was there as early as 1891 1

Bypass Rd, Wells
Post Rd bypass present in 1998 aerial photo, but not on 1990 topo map. 3

  DeLorme's 2004 Portland region street atlas shows this as mainline!
  So keep in mind when you see future references - DeLorme is fallible.

Old Post Rd, Arundel
Present route there as early as 1891 1

Main St, South Portland
Vaughan Bridge
West Commercial St (now Cassidy Point Rd), Portland

Bypassed by Veterans Memorial Bridge, 1954 2

Portland: Was US-1 ever at any point routed along Marginal Way & Tukey's Bridge?

Veranda St, Portland
East Deering bypass constructed after 19525; before 1957 1

Old Portland-Falmouth bridge, replaced 1943 12

road name unknown, Falmouth
[88]

Mainline in 1941; bypassed by 1957. 1

(295)S
  ~1/3 mile south of Tuttle Rd, Cumberland
  to interchange 15, Yarmouth

New alignment construced paralled to northbound carriageway; 1957. 1

(295) NB between interchanges 17 & 20
{1} was {1} and (95) NB; (295) NB was {1} and (95) SB
alignment constructed by 1957 1
(95) completed to interstate standards 198x (after 1983) 3
{1} reverted to its old 2-lane use at this time.

Noble Dr, Freeport
Woodside Ln
Baker Rd
Cedar Ln
Old Brunswick Rd
Both routes existed in 1892; this one appeared dominant. 1
abandoned roadway, Freeport
  south of Allen Range Rd
Mainline in 1892; bypassed by 1944. 1
Hillside Rd, Brunswick
Mainline in 1892; bypassed by 1944. 1
Pleasant St, Brunswick
Maine St
Bath Rd
State Rd, West Bath
Witch Spring Hill Rd, Bath

Pleasant St - Cook's Corner bypass opened 1962-11-01 6
Remaining freeway to Bath opened 196x (1967?)

Even older Bath alignment(s)
Carleton Bridge, Bath - Woolwich
Completed 1927. 9
Sagadahoc Bridge completed 2000. 10

Abandoned Roadway, Woolwich
George Wright Rd
Shaw Rd
Weston Rd

Mainline in 1945; bypassed by 1957. 1
Sanders Rd
Hunnewell Ln
abandoned roadway
  western segment not visible from terraserver
Mainline in 1893; bypassed by 1944 1

Flood Ln, Wiscasset
1893 mainline? 1
Wiscasset: Present Main St alignment built between 1893 and 1944 1
Original U.S. highway routing unknown.
Old Sheepscot River bridge, immediately north of current Davey Bridge
Replaced mid-80s 4
"Atlantic Hwy", Edgecomb
Mainline in 19571; bypassed by 19763

road name unknown, Newcastle
River Rd
Business {1}, Newcastle - Damariscotta

Mainline in 1957
Belknap Rd, Damariscotta
not shown on `44 topo, but alignment was straightened from 18931
Locust St
Center St, Damariscotta - Nobleboro

Mainline in 1941
Morgan Hill Rd, School St & Winslow Hill Rd
1915 alignment 1

abandoned roadway, Waldoboro
  south of Kalers Pond
W. Main St
Main St
Cole Rd
Goshen Rd
1915 mainline; bypassed by 1941 1
abandoned roadway, Warren
  at North Road jct
Stirling Rd
  thru Greenwood ave jct
abandoned roadway
Maple st
West Main St
1915 mainline; bypassed by 1941 1
abandoned roadway, Warren
  at Sandy Shores Rd jct
Mainline in 1906; bypassed by 19411
Cushing Rd, Warren
Old Bridge Rd
dismantled bridge, Warren - Thomaston
  still in service in 1941.
South Warren St, Thomaston
Mainline in 19411; bypassed by 19763
Old County Rd, Thomaston - Rockport
Shown as {1} on 1941 topo1, as well as the present alignment with variation(s) below. Wot's... uh the deal?
Pleasant St, Rockland
New County Rd
Mainline in 19411; bypassed by 19763
Presumably to remove two railroad crossings.
Both this variation on the modern alignment and Old County Rd are shown on the 1941 topo as {1}. What was actually signed?

Rockville St, Rockport
Mainline in 19411; bypassed by 19763
Pascal Ave, Rockport
Central St
Union St, Rockport - Camden
School St

Rerouted away from downtown Rockport between 19411 and 19763

road name unknown, Northport
  Crows Nest / Wrights Cove
Mainline in 1902; bypassed by 1943 1
Shore Rd, Northport
Cove Rd
Bypassed between 1902 and 1943 1
abandoned roadway, Northport
Pound Hill Rd
Bypassed between 1902 and 1943 1
Cross St, Northport
Bayside Rd
Bypassed between 1902 and 1943 1
Northport Ave, Belfast
High St
Pierce St
Veterans Memorial Bridge
Footbridge Rd

Veterans Memorial Bridge opened 1921; Belfast bypass opened 1963 11
Old Searsport Ave, Belfast
Mainline in 1943 1; bypassed by 1976 3

Old Route One, Searsport
road name unknown
abandoned roadway
Bypassed between 1902 and 1943 1
W Main St, Stockton Springs
E Main St

Mainline in 1943 1; bypassed by 1965 3

{1}/{1A} split & north...
Notre Dame Rd, Grand Isle
Looks like it, 1940 Grand Isle quad

BYPASS
04:03 Kittery

No old alignments here.

{1A} York

Ocean Ave & Long Beach Ave (SB)
2-way as recently as 1990?3

{1A} Portland

Commercial St
India St
Congress St
Washington Ave
Tukey's Bridge (Washington Ave)
1956 topo1


business
{1A}
Newcastle - Damariscotta

Belknap Rd, Damariscotta
not shown on `44 topo, but alignment was straightened from 18931
May or may not have been {1}, but not BUS{1} as this predates the Damariscotta bypass.

{1A} Rockland

No old alignments here.
Route commissioned 199x8
Slightly longer; about as built up - why not Old County Rd?

{1A} Stockton Springs - Ellsworth

Nothing here yet.

business
{1A}
Bangor - Brewer

Nothing here yet.

{1A} Milbridge - Harrington

Nothing here yet.

{1A} Jonesboro - Machias

Nothing here yet.

{1A} Mars Hill - Van Buren

Nothing here yet.

Sources:
  1.) UNH Library's Historic USGS Maps of New England & NY
  2.) http://www.portlandconnector.com/documents/AGENDAPortlandConnectorProjectGROUNDBREAKING_004.pdf
  3.) terraserver-usa.com
  4.) personal memory
  5.) Map of Portland Maine. Everett, Mass: Interstate Publishing Co., Inc, 1952
  6.) "New Highway Opens Today" Portland Press Herald 1962-11-01: 1.
  7.) Pope, Laura. "The bridge that opened the city’s downtown" Portsmouth Herald 2002-08-12
  8.) http://www.us-highways.com/altus.htm
  9.) http://www.mdf.org/downtown/portal/bath/history.html
  10.) Sagadahoc Bridge - Figg Engineering
  11.) Walsh, Tom. "Bypass, Not Impasse...A Tale of Two Cities" Ellsworth American 2005-07-21
  12.) nationalbridges.com
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Route markers are courtesy of Barry L. Camp.