Interstate 390/NYS Route 390 is a North-South expressway, running from the Lake Ontario State Parkway in the Town of Greece south to I-86/NYS Route 17. Along the way, it will take you past the Greater Rochester International Airport, Henrietta, Avon, Geneseo, Letchworth State Park and Dansville.
The small northern portion between the Lake Ontario State Parkway and I-490 is NYS Route 390. South of Interstate 490, the expressway becomes I-390; note the change in the shape and color of the route signs, and some non-visible changes in arcane state and federal roadway funding rules.
I-390 was originally going to be called I-486, as a spur route from a proposed I-86 in the Southern Tier. However, NY Route 17 did not become I-86 until 1999, 28 years after I-390 opened.
It is the 9th longest 3-digit Interstate in the country, and replaced the US Highway 15 corridor through New York State.
In the future, south of the Thruway, it may be renumbered I-99, as an extension of the Pennsylvania interstate along the US Highway 15 corridor that is planned to enter New York State SouthWest of Corning.
I-390 was originally supposed to continue North instead of veering West. This would have taken it along the Clinton Avenue corridor right through Brighton, the heart of Swillburg and the South Wedge. Needless to say, the kibosh got put down on that plan pretty quickly once houses started going down. Brighton's Persimmon Park was created on land originally acquired for the ill-fated Genesee Expressway. The extra wide bridge on S. Clinton Ave where it crosses the canal was originally intended to carry this highway.
In the city a mini-park at Sycamore, Avon, and Fountain Streets (Otto Henderberg Square) exists where some of the homes used to be. The vacant land between Broadway, I-490, Goodman Street and Alexander Street is also a legacy of this aborted plan.