Most of NY 412's former routing to Hamilton College became part of County Route 13 by 1978; however, the easternmost  is still state-maintained as NY 922C, an unsigned reference route.
By 1978, most of NY 412’s previous route to Hamilton College was transferred to County Route 13. Nonetheless, the easternmost part remains under state maintenance and is referred to as NY 922C, a non-numbered reference route.