Throughout its length NY 115 is maintained by the city of Poughkeepsie, Dutchess County (as CR 75), and the New York State Department of Transportation.

NY 115 was designated on April 1, 1980 as part of a maintenance swap by the New York State Department of Transportation, which took over the portion from Smith Street to the Taconic Parkway that was originally CR 75.

NY 115 continues on, passing King Street Park to the east before crossing into the town of Poughkeepsie at Arnold Road.

[4] NY 115 joins the Salt Point Turnpike northward, paralleling the St. Peter's Cemetery and passing near the Dutchess Community College as it enters Hyde Park.

Once in Salt Point, NY 115 crosses over Wappinger Creek just south of an intersection with CR 18 near the northern edge of the community.

The decision was reversed on appeal[5] The portion of the Salt Point Turnpike from the city of Poughkeepsie to the Taconic State Parkway was initially maintained by Dutchess County.

NY 115 also extended south along Innis Avenue to West Baker Street in Poughkeepsie as a county and city-maintained highway.