The route heads westward from the junction as a four-lane road named East Pulteney Street, passing north of the Corning Museum of Glass and serving a commercial area of the city.

The route soon passes into the adjacent village of Riverside, where it briefly widens to four lanes ahead of a partial interchange with the Southern Tier Expressway (I-86 and NY 17).

Outside Painted Post, the highway turns to the west, serving a handful of houses and two commercial buildings located adjacent to exit 43 of the Southern Tier Expressway.

The route continues on through the town of Erwin, paralleling the B&H Rail Corporation's main line and the north bank of the Cohocton River as it heads northwestward across gradually less developed areas of Steuben County.

NY 415 soon enters the hamlet of Coopers Plains, a small residential community centered around the route's junction with Meads Creek Road, which connects to exit 42 of the Southern Tier Expressway.

Past Coopers Plains, NY 415 enters the town of Campbell and makes a sharp turn to the north, crossing over the freeway to run along the undeveloped eastern side of the Cohocton River valley.

[7] NY 415 continues northwest from this point, intersecting with CR 17 (McNutt Run Road) before leaving the hamlet for less developed areas of the town.

[5] NY 415 heads northward across generally open fields along the base of the river valley to the town of Bath and its village of Savona.

The gully widens significantly about 3 miles (4.8 km) northwest of Savona, at which point NY 415 leaves the Southern Tier Expressway and the river to follow a slightly more northerly routing through the area.

NY 415 soon begins to parallel the B&H main line once again, leaving the village for substantially less developed areas of the town of Bath.

Roughly 2 miles (3.2 km) from the village, the route turns westward, passing under the Southern Tier Expressway to reach the Cohocton River and a junction with nearby CR 15 (Knight Settlement Road).

The route continues on, crossing the river and intersecting CR 14 (Campbell Creek Road) before leaving the residential community.

Past this point, NY 415 makes a gradual bend to the north, bypassing the nearby village of Avoca to the west.

[5] While on Maple Avenue, NY 415 remains a two-lane residential street as it crosses the B&H tracks once again near the Erie Railroad's old Cohocton station.

The highway subsequently crosses the Cohocton River and serves another residential section of the village before meeting CR 121 (Loon Lake Road), another connector leading to nearby I-390.

After CR 121, NY 415 turns northward out of the village, following the base of a narrow valley surrounding a tributary of the Cohocton River.

Outside of Cohocton, the route becomes North Dansville Road and serves a small number of homes scattered across otherwise open fields.

While NY 415 follows a series of prolonged east–west and north–south stretches that comprise the valley, the parallel I-390 takes a more linear path along the southwestern rim of the gully.

Both roads soon enter the town of Wayland, where NY 415 connects to the western terminus of CR 36 at a gap in the valley's eastern side.

Route 14, meanwhile, exited the Corning area on Water Street and followed what is now NY 415 through Savona, Bath, and Avoca to Cohocton.