 New York State Route 318 | ||||
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 Map of the Finger Lakes region with NY 318 highlighted in red | ||||
| Route information | ||||
| Maintained by NYSDOT | ||||
| Length | 10.90 mi[1] (17.54 km) | |||
| Existed | c. 1963[2][3]–present | |||
| Major junctions | ||||
| West end |    I-90 / New York Thruway / NY 14 in Phelps | |||
| East end |   US 20 / NY 5 on Tyre–Seneca Falls town line | |||
| Location | ||||
| Country | United States | |||
| State | New York | |||
| Counties | Ontario, Seneca | |||
| Highway system | ||||
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New York State Route 318 (NY 318) is an east–west state highway in the Finger Lakes region of New York in the United States. The western terminus of the route is at an intersection with NY 14 at New York State Thruway (Interstate 90 or I-90) exit 42 in the town of Phelps. The eastern terminus is at an intersection with U.S. Route 20 (US 20) and NY 5 northeast of the hamlet of Seneca Falls. All but 0.70 miles (1.13 km) of the 10.90-mile (17.54 km) route is located in Seneca County.
The origins of NY 318 date back to the 19th century when the highway was part of a road connecting the village of Phelps to a bridge over the Seneca River near Cayuga Lake. It was mostly designated as Route 6-a, an unsigned legislative route, by the New York State Legislature in 1911. The section of Route 6-a from West Junius to Halsey Corners was designated as New York State Route 291 (west of Magee) and part of NY 89 (east of Magee) as part of the 1930 renumbering of state highways in New York. NY 291 was removed in the 1940s.
The alignments of NY 89 and NY 414 north of Seneca Falls were largely flipped in the 1950s, placing both highways on their modern alignments. Part of NY 89's former routing became a short-lived extension of New York State Route 390. All of NY 89's former routing from Magee to Halsey Corners was designated as NY 318 c. 1963. NY 318 was extended west to NY 14 in the 1970s over former NY 291.