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1930 TO NOVEMBER 2026
State Road 23 is the frame's one state highway, and its number is younger than its road. The road northeast from South Bend through Granger to Edwardsburg — the wagon road to Michigan, along which the village's trade ran to the state line — was a county road until the state's renumbering era: the Indiana State Highway Commission's maps of 1 August and 30 September 1930 first carry the SR 23 designation on its modern routing, from U.S. 30 at Grovertown northeast through Walkerton, North Liberty and South Bend to the Michigan line (the number 23 itself had stood on an unrelated eastern-Indiana road before 1926 and gone unused in the 1926 renumbering; the designation was extended south from U.S. 30 to SR 10 only in 1950–51). The commission's maps of 1939 and 1941 show the route become "a high type of driving surface" in those years — the gravel-to-pavement succession, dated by the map record. In the frame, the highway's course is the diagonal the grid entry describes: it enters from South Bend — crossing under the Indiana Toll Road without access, a fact the INDOT route record states flatly — parallels the toll road briefly, meets SR 331 (Capital Avenue) at milepost 46.8, runs northeast through the commercial corridor the Businesses leg reads whole, and at the village's latitude curves due north for the state line, where at milepost 50.871 it becomes Michigan's M-62 into Edwardsburg. The whole road is 50.871 miles on INDOT's reference-post book; the four miles of it inside this frame carry the place's name in the junction tables: "Granger" is the listed location for the SR 331 junction.
The highway made modern Granger as surely as the railroad made the village: the corridor of the Businesses record — Granger Station, Heritage Square, Toscana Park, the bank and medical rows — is strung on SR 23 and its Adams Road crossing, and the widening of the two-lane state road into the multi-lane corridor of the growth decades is the road's second building. This section prints that widening at the strength the reached record supports: the programmed corridor projects in the widening-era entry below (the county's and INDOT's work at the corridor's crossings and feeders), and the corridor's own staged widening — project by project, from INDOT's archives and the Tribune's record — as a named gap, rather than a date asserted from memory. The corridor's live chapter is documented whole, because it closed this section's research: the intersection of SR 23 and Adams Road — where the stage road of the first entry meets the state road of this one, controlled today by a single stop sign — is programmed for rebuilding as a single-lane roundabout with Adams Road realigned some 250 feet northeast, under INDOT project DES 2003096; the department held its public hearing on 24 March 2026 at the Granger Missionary Church on Birch Road, and construction is anticipated to begin in spring 2028. The wagon road's crossing of the state highway, a stop sign in 2026, becomes a roundabout in 2028: the frame's whole transportation history in one intersection.
Sources: Indiana State Highway Commission, State Highway System of Indiana maps, 1926, 1 August 1930, 30 September 1930, 1939, 1941, 1950, 1951 (the designation's history and the 1939–41 surfacing, via the route's documented history); INDOT, Reference Post Book (July 2016) (length 50.871 miles; SR 331 junction at Granger, milepost 46.807; state line, 50.871); INDOT route description (the Toll Road underpass without access; the SR 331 junction's function for Exit 83); INDOT, "S.R. 23 and Adams Rd Intersection Improvement in St. Joseph County (Des 2003096)" project record and public-hearing legal notice (the roundabout design, the Adams Road realignment, the 24 March 2026 hearing at Granger Missionary Church, construction anticipated spring 2028); WNDU, 25 March 2026 (the hearing; the single stop sign's present control).