U.S. Route 71 in Missouri

First reassurance marker on US 71 after entering Missouri from Iowa.

US 71 enters Missouri in Jane coming from Arkansas. A new bypass known as the Bella Vista Bypass, goes around Jane and Bella Vista, Arkansas to connect with the freeway section of US 71 near Pineville opened October 1, 2021. At this point, Interstate 49 begins its concurrency with US 71. I-49 and US 71 pass through many smaller communities before reaching Joplin. In Joplin, I-49 and US 71 interchanges with Interstate 44 and begin a short concurrency from I-44 exits 11 through 18.

A few miles east of Joplin, I-49 and US 71 leave I-44 and heads north and enters Carthage. Due to the freeway being built, old sections of the highway have been bypassed and become county roads. I-49 and US 71 pass through Nevada and other communities before reaching the Kansas City area. In south Kansas City, at Bannister Road just north of the Grandview Triangle, US 71 ends its concurrency with I-49, and continues into downtown Kansas City as Bruce R. Watkins Memorial Drive. US 71 loses its freeway status for 3 blocks in Kansas City before becoming a freeway again and entering Downtown Kansas City. It is very unlikely that the freeway will continue all the way through, as a court order prevents the stoplights to be bypassed, even though MoDOT has the necessary right of way to do so.

In northern Kansas City, US 71 shares many overlaps with interstates, including I-70, I-35, and I-29. US 71 runs with I-29 through Kansas City north of Downtown until St. Joseph.

Once in St. Joseph, US 71 leaves I-29. US 71 runs north to Maryville. US 71 serves the small community of Clearmont before running through countryside into Iowa.

US 71 north of the Arkansas border prior to the completion of the Bella Vista Bypass.

In 1971, the highway was mostly two lanes south of Harrisonville, with the present-day bypass of Nevada and a brief segment between Butler and Rich Hill being the only other four-lane sections open between Harrisonville and Joplin.[2] However, by the end of the decade, much of the highway would be widened to four lanes, with a continuous four-lane highway now existing between Kansas City and the Barton-Jasper county line. Additionally, a short segment between Carthage and Webb City (present day Route 171) had been widened to four lanes.[3]

By 1987, a continuous four-lane link existed between Kansas City and Carthage, including a bypass around Carthage, as well as a widening of Alt. US-71 south of Carthage to I-44, creating the present-day I-49 bypass around Carthage and Joplin.[4] Save for a four-mile section of four-lane highway south of Neosho that was completed in the 1960s, the entire portion of US-71 (including Alt. US-71) south of Joplin to the Arkansas state line remained two lanes until 1999, when the present-day expressway from I-44 south to Neosho was completed. At this time, Alt. US-71 was decommissioned entirely, with the southern segment south of I-44 replaced by Route 59.[5] By 2004, the present-day expressway had been extended south to Pineville.

Projects along the highway were also made in the northern part of the state around this time, as US-71 was widened from two to four lanes between Savannah and Maryville, with various sections opening between 2001 and 2004.[6]

The future of part of the Bella Vista Bypass is on hold. On August 5, 2014, voters in Missouri defeated Amendment 7 at the polls, which would have provided funding various road construction projects in the state. After the measure's defeat, the funding for the connection from the existing southern end of I-49 in Missouri along the Bella Vista Bypass to the state line was in doubt, but Arkansas is moving ahead to construct all but the last connection to the state line.[7] In March 2019, the Missouri Highways and Transportation Commission approved the remaining funding needed to complete the Bella Vista Bypass.[8] Contracts was let in 2020. Construction began May 11, 2020, on Missouri's portion of I-49 and opened October 1, 2021.[9][10][11]

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