NY 635 begins at an intersection with
NY 5 (Erie Boulevard) two blocks north of the campus of
LeMoyne College in
Syracuse. As Thompson Road, NY 635 heads north and connects to
I-690 via the full
cloverleaf interchange that comprises exit 16. Just past I-690, NY 635 crosses over the Peat Street Runner, a
CSX Transportation railroad
spur that largely parallels I-690 into downtown Syracuse, prior to intersecting Burnet Avenue, a street connecting NY 635 to the nearby village of
East Syracuse. North of Burnet Avenue, NY 635 narrows slightly from six lanes to four lanes with a median as it heads along the eastern edge of the
Eastwood neighborhood of Syracuse. The road also acts as a divider between the residential neighborhoods of eastern Syracuse and the industrial factories situated along CSX Transportation's
Mohawk Subdivision rail line in
DeWitt. This division ends upon entering DeWitt, where NY 635 meets
NY 290 at an intersection centered on a bridge over the four-track main line. From this point north to its terminus at
Carrier Circle, NY 635 is surrounded completely by commercial and industrial properties, including the sprawling
Carrier Corporation complex just south of the circle. At the circle, NY 635 officially terminates upon meeting
NY 298; however, it also connects to the
New York State Thruway (
I-90) at exit 35 by way of the loop. ==History==