U.S. Route 31

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U.S. Route 31 marker

U.S. Route 31
Route information
Length: 1,280 mi[2] (2,060 km)
Existed: November 11, 1926 (1926-11-11)[1] – present
Major junctions
South end: US 90 / US 98 in Spanish Fort, AL
North end: I-75 in Mackinaw City, MI
Highway system

U.S. Route 31 or U.S. Highway 31 (US 31) is a long north–south highway connecting southern Alabama to northern Michigan. Its southern terminus is at an intersection with US 90/US 98 in Spanish Fort, Alabama. Its northern terminus is at an interchange with Interstate 75 (I-75) south of Mackinaw City, Michigan.

US 31 once crossed the Straits of Mackinac by car ferry to intersect US 2 north of St. Ignace, Michigan, in the Upper Peninsula and then formerly reached Mackinaw City along the southern approaches of the Mackinac Bridge (which has been taken over by I-75). It also formerly entered downtown Mobile, Alabama, via a long bridge over Mobile Bay.

Route description[edit]


Within the state of Alabama from Birmingham north to Decatur, this highway is sometimes called the "Decatur Highway." From Birmingham south to Montgomery, US 31 is sometimes called the "Montgomery Highway." South of Montgomery, US 31 is sometimes called the "Mobile Highway". Markers in North Alabama also identify it as the "Beeline Highway".

In downtown Birmingham, with I-20/I-59 is also the northwestern terminus of US 280 in Alabama. US 31 and US 280 travel together along the Red Mountain Expressway Cut (the "Elton B. Stevens" Expressway), leading to the southern and southeastern suburbs of Birmingham.

Well north of Birmingham, US 31 shares the roadway with I-65 between Blount Springs (exit 289) and Hayden (exit 287) because US 31's roadway was converted back in the early 1960s to I-65 to cross several ridgelines of the southwestern Appalachian Mountains. This highway, which was ungraded to Interstate Highway standards, was the first stretch of Interstate Highway to be opened to traffic in Alabama.

US 31 and I-65 also share the roadway for 14 miles (23 km) from mile marker 354 in Athens, Alabama, to Tennessee's mile marker 1 in Ardmore. There are no highway signs confirming this in either state on this stretch, aside from the directional signs at the entrance ramps in Athens and Ardmore. However, this is shown on the official highway maps of both states. The original roadway of US 31 between the two locations still exists as State Route 251 (SR 251) in Alabama and SR 7 in Tennessee between Athens and Ardmore.

US 31 is paired with the unsigned SR 3 throughout the state.


The first mile of US 31 in Tennessee is concurrent with I-65. From that point it parallels I-65 to downtown Nashville. At Pulaski the southern terminus of US 31A in Tennessee. US 31 continues due north through Lynnville, Columbia, Spring Hill, Franklin and Brentwood to Nashville. The route splits into US 31E and US 31W in Nashville.


US 31E stays east of I-65, passing through Glasgow and Bardstown. It enters Louisville from the southeast, where it is named Bardstown Road for most of its length in the city.

US 31W closely follows I-65 from the Tennessee state line, through Bowling Green, to Elizabethtown. From here, it diverges to the west and passes through Fort Knox. North of Fort Knox, US 31W joins with US 60 in Kentucky and it roughly follows the Ohio River into Louisville. In southwestern Louisville, US 31W is called Dixie Highway. It is the major commercial street in this area.

US 31E and US 31W rejoin in Downtown Louisville at Second Street, and immediately cross the Ohio River on the Clark Memorial Bridge.


Formerly, the reunion of US 31E and US 31W took place in Sellersburg. US 31 travel concurrent with I-65 in Jeffersonville, after having crossed the Ohio River from Kentucky. It splits off north of Jeffersonville at Clarksville and proceeds to Indianapolis. At I-465 on the south side of Indianapolis, US 31 is routed onto I-465 on the east side of the city. US 31 exits I-465 in extreme southern Hamilton County, and continues northward. US 31 then passes through or near Carmel, Kokomo, Rochester, Plymouth and, Lakeville. As approaches southern South Bend it travels concurrent with US 20 in Indiana and proceeds westwards then north on the St. Joseph Valley Parkway, bypassing South Bend and proceeding into Michigan.



In the 1930s, US 31 continued from St. Ignace across the Straits of Mackinac, and intersected US 2 (Mackinac Trail and what later became M-123).

Before the Interstate era, US 31 was a major north–south highway. I-65 supplanted US 31 and either US 31W or US 31E as a through route between Mobile and Indianapolis. South of Indianapolis, all segments of US 31 not traveling concurrently with I-65 have been reduced to roads largely of local use. I-196 now carries the route of US 31 between Holland, and St. Joseph, Michigan. All of US 31 between Indianapolis and Ludington, Michigan, is divided highway—some of it is freeway, including a bypass route of South Bend, Indiana. The segment between Indianapolis and South Bend is scheduled for upgrade or replacement with Interstate-standard freeway. Environmental impact studies have shown that the fifth phase of the then-to-be-constructed freeway segment between Napier Avenue near Benton Harbor, Michigan, and I-94 may not be complete until 2015.

The portion of I-75 north of US 31's northern terminus toward the Mackinac Bridge was designated part of US 31 prior to the 1990s and was US 31's northernmost portion to be built to freeway status. Since its truncation at the I-75 interchange, however, the northernmost segment of the US 31 freeway ends near Ludington.

In Alabama, US 31 follows portions of the Pulaski Pike beginning at the Alabama–Tennessee State line at Ardmore, and was originally routed on what is now called Alabama State Route 257 (SR-257). It follows roughly along the Decatur Stage Road to the site of Rhodes Ferry in Decatur, and also intersected and follows portions of the Stouts Road to Birmingham. From Birmingham, it follows portions of the Columbiana Road and roughly parallels it in Hoover along the present widened route and intersects with the Ashville-Montevallo Road or the Cahaba Trail (SR-119) and follows it on a branch to Calera. US 31, beginning in Chilton County, follows a branch of the Talladega-Montgomery Stage Road, a road that went from Talladega and went south from Columbiana to near present-day Clanton, Verbena, and Montgomery, and was operated by Jemison, Ficklin, & Powell, who operated stagecoaches on the road. US 31 in Prattville came to the site of Reese's Ferry on the Alabama River, where it was replaced by the present bridge near Prattville. From Montgomery, US 31 follows parts of the Federal Road, and is presently routed on the Greenville Branch of the Federal Road, and follows the Montgomery-Mobile Road through Conecuh, and Escambia Counties and also intersects with the Pensacola Trading Path or the "Old Wolf Trail" from Burnt Corn.

At its southern end, US 31 originally traveled further west than it currently does, passing through Spanish Fort, Alabama. It crossed Mobile Bay via several narrow bridges, including the Admiral Raphael Semmes Bridge, a drawbridge spanning the Tensaw River. It turned north along the east bank of the Mobile River, crossing the river into Plateau, over the former Cochrane Bridge, another old drawbridge where the current Cochrane–Africatown USA Bridge is now located. It then turned south to end at US 90. It now officially ends at US 98 in Spanish Fort.


US 31 has three planned relocation sections in northern Indiana. US 31E has one planned relocation section in central Kentucky. US 31 has one planned relocation section in southern Tennessee. The Indiana Department of Transportation said that they are going to put US 31 on a concurrency with I-65 from Louisville to Indianapolis. US 31 will become Indiana State Road 931 (SR 931) between those two cities. SR 931 will pass through or near Greenwood, Franklin, Edinburgh, Columbus, Seymour, Austin, Henryville, Sellersburg, Clarksville, and Jeffersonville. The Tennessee Department of Transportation and the Alabama Department of Transportation both said that they are going to let US 31 travel concurrently with I-65 from Falkville, Alabama to Athens, Alabama. US 31 from Falkville to Ardmore, Tennessee will be redesignated Tennessee State Route 231 (SR 231) and Alabama State Route 931 (SR-931). SR-931 will pass through or near Tanner. SR-331 will pass through or near Decatur and Hartselle. The Indiana project should have been done by the end of 2014. Traffic is expected to switch to the new lanes on US 31 in northern Indiana by the end of 2014. US 31 has one planned relocation section in southern Michigan. The Tennessee project should be done by the end of 2016.

Major intersections[edit]

Southern segment
US 90 in Spanish Fort
US 29 in Flomaton. The highways travel concurrently to Brewton.
US 84 southwest of Evergreen. The highways travel concurrently to east of Evergreen.
I-65 on the Hope Hull-Montgomery line
US 80 in Montgomery
US 82 in Prattville
I-65 north of Prattville
I-65 in Clanton
I-65 in Calera
I-65 in Alabaster
I-459 in Hoover
I-65 on the Hoover-Vestavia Hills city line
US 280 in Homewood. The highways travel concurrently to Birmingham.
US 78 in Birmingham
US 11 in Birmingham
I-20 / I-59 / US 280 in Birmingham
I-22 in Birmingham
I-65 in Birmingham
I-65 in Smoke Rise. The highways travel concurrently through the town.
US 278 in Cullman
I-65 south-southeast of Lacon
US 72 in Athens
I-65 in Athens. The highways travel concurrently to Ardmore, Tennessee.
US 64 in Pulaski
US 412 in Columbia
US 431 in Franklin. The highways travel concurrently through the city.
US 41 / US 70S in Nashville. The highways travel concurrently through the city.
US 70 / US 70S / US 431 in Nashville. US 31/US 431 travels concurrently through the city.
US 31E / US 31W / US 41 / US 431 in Nashville
Northern segment
US 31E / US 31W / US 60 in Louisville
I-65 in Jeffersonville. The highways travels concurrently to west of Jeffersonville.
I-65 south-southeast of Crothersville
US 50 in Seymour
I-65 in Taylorsville
I-74 / I-465 / I-69 / US 36 / US 40 in Indianapolis. I-74/US 31/US 36/US 40 travels concurrently through the city. I-465/US 31 travels concurrently to Carmel.
I-65 in Indianapolis
I-74 / US 421 in Indianapolis. US 31/US 421 travels concurrently to Carmel.
US 52 in Indianapolis. The highways travel concurrently to Carmel.
I-70 in Indianapolis
I-69 in Indianapolis
I-465 / US 52 / US 421 in Carmel
US 35 east of Kokomo. The highways travel concurrently to north-northeast of Kokomo.
US 24 in Peru
US 30 east of Plymouth
US 6 southeast of La Paz
US 20 in South Bend. The highways travel concurrently through the city.
I-80 / I-90 in South Bend
US 12 in Bertrand Township
I-94 in Benton Charter Township. The highways travel concurrently through the township.
I-94 / I-196 in Benton Charter Township. I-196/US 31 travels concurrently to Laketown Township.
I-96 in Norton Shores
US 10 in Amber Township. The highways travel concurrently through the township.
US 131 in Petoskey
I-75 in Mackinaw Township

Bannered routes[edit]

See also[edit]


  1. ^ McNichol, Dan (2006). The Roads that Built America. New York: Sterling. p. 74. ISBN 1-4027-3468-9. 
  2. ^ Droz, Robert V. "The Big Table". U.S. Highways: From US 1 to (US 830). Retrieved July 4, 2006. [self-published source]

External links[edit]

Browse numbered routes
KY 30 list KY 32