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At its maximum extent, US 112 measured 203.5 miles in total length.

​For the first ten years of its existence, US 112 did not make it all the way to New Buffalo; originally its west end was in Elkhart; this is from AASHO's April 1927 route log:

This photo was taken looking south on Main Street at Jackson Street.  US 20 was routed on Jackson at the time (and likely US 33 as well), so the US 112 designation probably ended here:

This shot was looking north on Main at Jackson, and thus at the original west beginning of US 112:

In about 1932, and for a very brief time, US 112 was extended west along IN hwy. 2, ending at US 20 in Rolling Prairie...

...but it seems that around 1935, the decision was made to change US 112 such that it stayed entirely within Michigan, running through Niles to New Buffalo.  However, before that happened, there may have been a brief transitional period during which the "old" US 112 to Rolling Prairie was signed as "US 112-S"...

...but by about 1936 it appears that US 112 was signposted westward to New Buffalo, and the "US 112-S" designation had already been eliminated:

This photo was looking at the historic New Buffalo endpoint of US 112.  Today this is westbound US 12, which continues to the left.  But formerly eastbound US 12 was to the right, via what is now known as the "Red Arrow Highway", through Benton Harbor:

This photo was looking east on US 12.  Today the US 12 designation turns right ahead, through interchange 4 on I-94, and on to Niles.  Butoriginally US 12 went straight ahead on Red Arrow, while to the right was the west beginning of US 112:

Heading the opposite direction, this shot shows the view from what was formerly westbound US 12; the historic west beginning of US 112 was to the left:

Back then, if one were to turn that direction, they would have seen a US 112 reassurance marker posted on this road: