Interstate 49 (I-49) is a north–south Interstate Highway with multiple segments. The original portion is entirely within Louisiana with an additional signed portion extending from I-220 in Shreveport to the Arkansas state line, three newer sections are in Arkansas, and one section in Missouri. Its southern terminus is in Lafayette, Louisiana, at I-10 while its northern terminus is in Kansas City, Missouri, at I-435 and I-470. Future plans include portions of the remaining roadway in Louisiana, Arkansas, and Texas, to link Kansas City, Missouri with New Orleans.
Although not part of the original 1957 Interstate Highway plan, residents of Missouri, Arkansas, and Louisiana began campaigning for the highway in 1965 via the "US 71 - I-29 Association". The campaign called for I-29 to be extended south from Kansas City to New Orleans following much of the route along U.S. Route 71 (US 71). The plan called for creating a limited access expressway from New Orleans to the Canadian border and on to Winnipeg (via Manitoba Highway 75). When I-49 is complete, the goal of the association will have been accomplished, with only a brief gap between the Grandview Triangle and I-29 at the Kansas City Downtown Loop served by US 71 (Bruce R. Watkins Memorial Drive) or other Interstates such as I-435 and I-70 in Kansas City.
Route description
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Louisiana
The southern terminus of I-49 is located at a cloverleaf interchange with I-10 and US 167 in the southern Louisiana city of Lafayette. Southbound motorists continue through the interchange onto the Evangeline Thruway, which transitions from a limited-access portion of LA 182 to a major divided thoroughfare that picks up the US 90 corridor heading through the heart of Lafayette. I-49 begins its journey concurrent with US 167 as it travels northward through Carencro, Sunset, Grand Coteau, and Opelousas. US 167 departs from the Interstate's alignment at exit 23 between Opelousas and Washington, and I-49 begins to take a northwesterly path through the heavily wooded rural terrain. Various state highways provide access to the small towns and cities located along the parallel US 71 and US 167 corridors, such as Lebeau, Ville Platte, Bunkie, and Cheneyville. After crossing US 167, I-49 travels between US 71 and US 165 into the Alexandria metropolitan area in central Louisiana.
I-49 travels through downtown Alexandria doubling as U.S. Highway 71 Bypass (US 71 Byp.) and is also concurrent with portions of US 167 and Louisiana Highway 28 (LA 28). Major interchanges with US 167 and US 71 lead to bridges that cross the Red River into the neighboring city of Pineville. Continuing northwest from Alexandria, I-49 parallels the Red River and LA 1 through Boyce and passes just west of the historic city of Natchitoches, which is reached via LA 6 at exit 138. Between Natchitoches and Shreveport, I-49 travels between LA 1 and US 171 and has junctions with US 371 and US 84, connecting with Coushatta and Mansfield, respectively.
In Shreveport, the Interstate heads directly into the downtown area and terminates at I-20, a route that facilitates eastbound traffic. However, through traffic bound for I-20 west and the northern segment of I-49 is directed to transfer onto LA 3132 at an interchange located about south of this terminus. LA 3132 is a western freeway bypass of Shreveport known as the Inner Loop Expressway that becomes I-220 upon intersecting I-20. On the northside of town, motorists may exit I-220 and follow the next segment of I-49, which parallels US 71 into Arkansas.
The heaviest traffic on I-49 occurs within the cities of Shreveport and Opelousas. The stretch of freeway in Shreveport sees an average of 70,000 vehicles per day, while the stretch of freeway between Lafayette and Carencro sees an average of 55,000 vehicles per day, and the stretch of freeway through Opelousas sees an average of 45,000 vehicles per day between the Judson Walsh Drive and Creswell Lane exits.
During the sugarcane season, many trucks and tractors pulling heavy cane wagons cause traffic congestion and accidents.
Arkansas
I-49 in Arkansas is composed of three disconnected segments: northern, southern, and a short connector skirting Fort Smith near Fort Chaffee designated as AR 549.
The southern segment of I-49 enters Arkansas from Louisiana. The short segment progresses northward to a temporary terminus at US 71 and US 59 at the Texas state line north of Texarkana.
The northern segment of I-49 in Arkansas, most of which was formerly signed as part of I-540, begins at I-40 in Alma and runs north to Northwest Arkansas through the Boston Mountains. The freeway passes through steep, sparsely populated terrain before entering the Bobby Hopper Tunnel in Washington County. Entering Northwest Arkansas, I-49 has seven exits for Fayetteville and three exits for Springdale before entering Benton County. The route serves as the boundary between Bentonville and Rogers, with seven exits for the two cities. After an interchange with US 71 just south of the Bentonville–Bella Vista city line, I-49 follows the Bella Vista Bypass, which runs to the south and west of Bella Vista before crossing into Missouri.
I-49 is designated as the Boston Mountains Scenic Loop between Alma and Fayetteville. The I-49 designation replaced the I-540 designation through Northwest Arkansas in March 2014, with the exception of the Bella Vista Bypass, which was constructed between July 2011 and October 2021.
Missouri
I-49 enters Missouri from Arkansas on the Bella Vista Bypass, eventually reuniting with US 71 south of Pineville. Continuing northward, I-49 passes through several smaller communities, including Neosho, before reaching Joplin. In Joplin, I-49 junctions with I-44 and begins a short concurrency with I-44 for exits 11 through 18.
Just a few miles east of Joplin, I-49 leaves I-44 and heads north and enters Carthage, intersecting with Interstate 49 Business (I-49 Bus.)/Route 171, which provides an alternate route for northbound I-49 travelers through Joplin. I-49 then passes through Nevada and other communities before reaching the Kansas City metropolitan area. I-49 intersects with I-470 and I-435, which provides connection to I-70, I-35, and I-29.
In south Kansas City, at Bannister Road just north of the Grandview Triangle, the I-49 designation ends, and the freeway continues as Interstate 435 north to I-70 west and the expressway continues as US 71, which proceeds into Downtown Kansas City as Bruce R. Watkins Memorial Drive.
History Louisiana The original plans for the Interstate Highway System did not include a north–south connection between I-10 and I-20 within Louisiana. In 1965, Governor John McKeithen proposed a toll road to perform this function and extend it to New Orleans, but the idea was never carried out. In the mid-1970s, the Federal Highway Administration (FHWA) approved an Interstate Highway to run between US 190 in Opelousas and I-20 in Shreveport, a route that was designated as I-49 by the American Association of State Highway and Transportation Officials (AASHTO) in the summer of 1977. The mileage was gained from mileage released from other highways the states did not build and from a supplemental reserve. In 1981, AASHTO approved a slight extension of the designation along the existing route of US 167 from Opelousas south to I-10 in Lafayette. In its early history, I-49 was commonly referred to as the North–South Expressway.
Construction of I-49 began in 1981 between Opelousas and the small town of Washington. This segment joined the portion running concurrent with US 167, an existing limited-access highway, and was completed by 1983. By the following year, virtually all remaining rural portions of the route were under construction, and 95 percent of this mileage was completed and opened to traffic between late 1987 and late 1989. The remaining portions running through the urban centers of Alexandria and Shreveport required a much greater expenditure of time and funding. The entire length of the road was completed on May 1, 1996, with the opening of a section in downtown Alexandria named the Martin Luther King Jr. Highway. The total cost of I-49's construction was about $1.38 billion (equivalent to $ in ). In 1991, the Intermodal Surface Transportation Efficiency Act (ISTEA) was passed designating an extension of I-49 to Kansas City, Missouri as "High Priority Corridor 1."
"Interstate 49 North" was a construction project that extended the highway from I-20 in Shreveport to the Arkansas state line and was divided into 11 segments. On November 27, 2013, the first section between LA 1 and US 71 opened to traffic, and the extension to a point just south of the Arkansas state line opened in March 2014. On May 31, 2017, a portion between LA 3194 (Martin Luther King Jr. Drive) and LA 1 in Shreveport was opened to northbound traffic. On June 15, 2018, the entire portion of I-49 between I-220 and LA 1, including an interchange with I-220, was opened to traffic. The remaining interchange ramps opened to traffic on October 17, 2018.
Arkansas and Missouri Arkansas and Missouri pursued an I-49 designation for US 71 and I-540 for many years. In the early 2000s, there were plans by both states to rename the roadway as such between I-44 west of Joplin and I-40 at Fort Smith once a new bypass of US 71 had been completed around Bella Vista, Arkansas, and north to Pineville, Missouri. However, the AASHTO Special Committee on U.S. Route Numbers and Interstate Highways denied the I-49 designation at their annual meeting in September 2007 because none of the new roadway was yet under construction. During this time, there was also some debate as to whether the I-29 designation should be extended farther south from its current terminus in Kansas City to either Joplin or all the way to Fort Smith.
The I-49 designation, consisting of in Missouri, became official at noon on December 12, 2012. The designation applies to current US 71 between I-435 in south Kansas City and Route H at Pineville (McDonald County), which was expanded to Interstate standards beginning in 2010. The last of the expansion projects was completed in December 2012. I-49 also runs concurrently with I-44 between exits 11 and 18 east of Joplin.
The Missouri Department of Transportation (MoDOT) began installing I-49 trailblazer signage (without shields) along with gantry signs and milemarkers, about 1200 signs in all, in February 2012. Signage bearing I-49 shields was covered or turned from view until the I-49 designation received final approval by FHWA. This includes milemarkers at intervals along the entire alignment apart from I-44.
The US 71 expansion involved removing all at-grade intersections and constructing interchanges and overpasses at 15 sites between Harrisonville and Lamar. The two-year project represented a shift in funding priorities for MoDOT, which, in 2007, announced the indefinite postponement of its portion of the Bella Vista bypass project, citing a $139-million (equivalent to $ in ) funding gap in Arkansas between construction costs and toll revenues, and Arkansas's commitment to only a two-lane bypass constructed over six years. MoDOT announced the Joplin-to-Kansas City expansion of US 71 in August 2010, to be done with the intention of bringing the I-49 designation to Missouri.