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2013–November 2026 · the old road's modern course
SR 931 is a designation for former U.S. 31, coined once for Kokomo and reused a year later for Lakeville. The number's first life is southern and prints at pointer size: designated in 2013 when US 31 was rerouted onto the Kokomo bypass, for the old road there — itself a relocated US 31 of 1952 — 11.592 miles from US 31 south of Kokomo to US 31 north of it. Its second life is this town's: "In 2014 the segment of US 31 freeway from US 30 near Plymouth to US 20 (St. Joseph Valley Parkway) in South Bend opened, and the segment of what had been US 31 in St. Joseph County outside of South Bend became SR 931." A removal was once expected — "this segment had been expected to be removed from the state highway system in mid-2018" — and did not happen; SR 931 stands current in November 2026. The course whole, at Reference Post Book strength (the department's July 2015 book, as carried in the route record's junction table; the book itself is the settler for a direct read): the southern terminus is the Marshall–St. Joseph county line, at continuous log mile 11.592, the junction there listed as "Michigan Road"; State Road 4 at Lakeville stands at log mile 16.032; the northern terminus is the South Bend city line, about 500 feet north of Roosevelt Road, at log mile 20.428 — a segment of 8.836 miles. The log's miles are continuous with the Kokomo segment's (which ends at 11.592 north of Kokomo): the two segments share one reference-post series, which is why Lakeville's junction prints at "16.032" on an 8.8-mile road — printed here so the numbers are not misread as an error. — is: continuous through Lakeville, and ended at the county line south of town. The route record states the southern disposition expressly: "The bypassed portion in Marshall County was transferred to the county and to the town of La Paz rather than being retained by the state." Conflict C112 — SR 931 at La Paz, printed whole: the La Paz place article states the town "is located on former U.S. Route 31 (now Indiana State Road 931), just to the north of where it intersects with U.S. Route 6," and its simple-language twin repeats the junction of US 6 and SR 931 — against the log table's county-line terminus and the transfer sentence above. The log table is the stronger carrier; the La Paz wording is treated as loose usage for the old road's continuation, and the settler is named (the Reference Post Book read directly; the department's Marshall County roadway inventory). The number's presence in town is independently provable from the town's own addressing: Hoosier Racing Tire's address of record, on the company's own bulletin letterhead, is 65465 SR 931, Lakeville — a places carrier puts the site at 41.543665, −86.270854, north of the town point between the centre and the SR 4 junction's latitude band, consistent with the log; the address proves SR 931 addressing in Lakeville, and bears on nothing south of the county line.
Principal sources: the SR 931 route record, incorporating INDOT's Reference Post Book (July 2015) junction table (secondary carrier of the official book; the direct read named as settler at C112); the La Paz place article (the conflict's other side); Hoosier Racing Tire Co. bulletin, 12 January 2024 (the address, company's own carrier).