New York State Route 18

New York State Route 18 (NY 18) is an east–west state highway in western New York in the United States. It runs parallel to the south shore of Lake Ontario for most of its length between Niagara County and Monroe County. NY 18, which also passes through Orleans County, acts as a northerly alternate to NY 104, another east–west route that parallels NY 18 to the south on Ridge Road. The western terminus of NY 18 is at a complex grade-separated interchange with NY 104 outside the village of Lewiston. Its eastern terminus is at a junction with NY 104 in an area of Rochester known as Eastman Business Park.

NY 18 was assigned in 1924 and originally extended from the Pennsylvania state line near Salamanca to downtown Buffalo via Dayton and Hamburg. It was extended northeast to Rochester via Niagara Falls as part of the 1930 renumbering of state highways in New York and east to NY 250 in the town of Webster by the following year. NY 18 was truncated on its west end to the town of Lewiston in the early 1960s and on its east end to Rochester in the early 1970s.

Although NY 18 is signed as east–west, it runs primarily north–south through the western portion of Niagara County. After leaving Niagara County, NY 18 shifts farther south, gradually moving away from the shore of Lake Ontario. In central Orleans County, NY 18 meets the Lake Ontario State Parkway at the Lakeside Beach State Park. The parkway then becomes the lakeside road, and NY 18 veers south to follow a more inland routing.

NY 18 begins at a junction with NY 104 south of a complex grade-separated interchange that includes NY 18F, NY 104, and the Niagara Scenic Parkway on the eastern edge of the village of Lewiston. From NY 104 east, a right-turn ramp allows access to Creek Road Extension, the first street that modern-day NY 18 occupies. NY 104 continues north from the ramp, passing over NY 18 westbound (which terminates at the merge ramp with NY 104 west) on its way to the village while NY 18 proceeds to the northeast on Creek Road Extension, bypassing Lewiston to the southeast. After 0.5 miles (0.8 km), the highway curves to the north and meets NY 104 at an unconventional grade-separated interchange that has a pair of two-way ramps connecting the two state routes. NY 18 continues on, passing under NY 104 and paralleling the Niagara Scenic Parkway as it proceeds north.

At a wye in the Porter hamlet of Blairville, NY 18 breaks from its north–south alignment and turns to the northeast before curving northward once more, returning to a perfect north–south alignment at an intersection with NY 93 in the hamlet of Towers Corners. Southwest of the Four Mile Creek State Park, NY 18 turns a full 90 degrees to the east and begins to parallel the southern shore of Lake Ontario. Here, NY 18 meets the northern terminus of NY 18F, changes names from Creek Road to Lake Road, and becomes part of the Seaway Trail, a National Scenic Byway. The route proceeds northeast to Four Mile Creek State Park, where it intersects the northern end of the Niagara Scenic Parkway. East of the park, NY 18 gradually moves to the north, decreasing the area between the route and the lakeshore as it proceeds east.

Now in Wilson and less than 100 yards (91 m) from the lakeshore, NY 18 meets the northern terminus of NY 425. Farther east, in Olcott, NY 18 intersects the northern extent of NY 78. On the eastern edge of town, the route intersects Transit Road, which runs along the transit line first surveyed by the Holland Land Company. This portion of Transit Road does not meet the NY 78-occupied portion in Lockport, however. After meeting the northern end of NY 148 in Somerset, NY 18 intersects the northern terminus of NY 269 at the Niagara–Orleans County line.

Across the county line, NY 18 becomes the Roosevelt Highway. It continues across the northern edge of the county and the southern fringe of Lake Ontario, meeting the northern terminus of NY 63 in Yates Center, north of Lyndonville. While NY 63 ends here, Lyndonville Road continues north to the lake as County Route 63-1 (CR 63-1). This portion of Lyndonville Road was once part of NY 63. In Carlton, NY 18 intersects the northern terminus of NY 279, the last in a series of north–south routes that terminate at NY 18. Not far to the east, the route serves Lakeside Beach State Park and indirectly connects to the western terminus of the Lake Ontario State Parkway. At this point, the Seaway Trail leaves NY 18 to follow the parkway along the lakeshore.

East of the park, NY 18 breaks from the Lake Ontario shore and begins to make its way southward, curving to the southeast as it meets NY 98 north of the hamlet of Baldwin Corner. The routes converge to form a concurrency south to the hamlet, where NY 18 continues east. At the Carlton–Kendall town line, NY 18 curves southeastward once again before reverting to an easterly alignment in Kendall. After passing NY 237 south of the hamlet of Kendall, NY 18 intersects NY 272 at the Orleans–Monroe County line. NY 18 merges onto the county line road, overlapping NY 272 along the county line for just under 1 mile (1.6 km) to the continuation of Roosevelt Highway, where NY 18 continues east into Monroe County.