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From this 1969 map

• Route 66, US 71, Route 171 (probably split at Old 66 Boulevard west of CR-180), Route 96 through Joplin and Webb City to west of Springfield (unclear if it joined I-44 via Route 96 or Route 266 - definitely Route 96 on 1969 USGS)
• I-44 at Springfield
• I-44 at Lebanon
• I-44 at Rolla
• Route 366, Route 30 and I-55 into Illinois (I-44 was not built yet)

So it's likely that when US 66 was decommissioned in Missouri in 1979 (to US 71) and 1985 (the rest of the way), it was only separate from I-44 west of Springfield. [1] says that it actually used Route 66 all the way to I-44 east of Joplin. Anyone know for sure? -- SPUI ( T - C - RFC) 08:41, 3 May 2006 (UTC) reply

[2] has some details on the St. Louis alignments. -- NE2 16:26, 14 July 2007 (UTC) reply

In addition to the main route, the following routes are signed with years specified:

• 1930-1955 from Main/2nd in Joplin to Broadway/Madison in Webb City (this was U.S. Route 66 Alternate)
• 1947-1975 in Joplin from Main/7th to Range Line/Zora (though it's labeled as US 66 on the 1945-46 official)
• 1936-1970 from Bypass/Chestnut to Glenstone/Kearney in Springfield
• 1926-1928 from Division/Glenstone in Springfield to Route 125/OO in Strafford
• 1926-1933 from I-44 Bus./Route 100 in Gray Summit to Choteau/Tucker? in St. Louis
• 1936-1965 from Lindbergh/Watson in Sunset Hills to the state line on the new Chain of Rocks Bridge (this was U.S. Route 66 Bypass after ca. 1956)

and perhaps others.

The main route is signed along the following:

• U.S. Route 71 Business (Joplin, Missouri), bypassed by 1947-1975 route
• U.S. Route 66 Business (Webb City, Missouri), bypassed ca. 1953 by what's now mostly freeway (actually the old US 66 is signed, which did not all become US 66 Bus.)
• U.S. Route 66 Business (Springfield, Missouri), bypassed by 1936-1970 route
• U.S. Route 66 Business (Lebanon, Missouri), bypassed ca. 1958 by current I-44
• U.S. Route 66 Business (Waynesville, Missouri), bypassed ca. 1954 by current I-44
• U.S. Route 66 Business (Rolla, Missouri), bypassed ca. 1955 by current I-44
• U.S. Route 66 Business (Pacific, Missouri), bypassed ca. 1964 by current I-44

-- NE2 23:58, 22 February 2015 (UTC) reply