It seems that the MedRd point at the southern terminus should instead be CR 353(Delaware Turnpike) or CR 351.
I'll go with
CR351.
NY85 itself seems to go on a wee bit longer:
END signTDV and shapefiles agree, with shapefile coords from putting an endpoint
here.
END CR353 is posted at the other side of the bridge. (What, is the bridge itself a short gap between the two routes?) I'm willing to call that an imprecision in field signage, and call the end CR353, as does the
Traffic Data Report.
This is annoying, though.