A long term project currently underway in Binghamton, New York addresses both the notorious “Kamikaze Curve” section of New York 17 (Southern Tier Expressway) and replaces the structurally deficient bridges both over the Chenango River and at the directional T interchange joining the future I-86 with Interstate 81. Named after adjacent Mt. Prospect, project work was awarded on November 1, 2011, with major construction underway in spring 2012.
Phase I work replaces the I-81 & NY 17 bridges over the Chenango River. This includes four spans, where the two routes come together above U.S. 11. Adjacent construction reconfigures the ramps to Mygatt Street from the Southern Tier Expressway.
Phase II work reconfigures the full cloverleaf interchange (Exit 4) with New York 7 into a parclo interchange. It also adds a collector distributor system separating movements to NY 7 from the west and from NY 7 to the west. This includes two additional flyovers over the Chenango River, one for the future I-86 eastbound mainline, the other for the a ramp to I-86 west from NY 7. The I-81 & NY 17 mainline will also be expanded to six overall lanes east to Broad Avenue (Exit 3) and beyond.
Posted below are photos we took through the area on January 17, 2017 from I-81 north.
Phase II construction also addresses New York 17 at Exits 71 and 72 as well. Work commenced in March 2016 and is anticipated for completion in fall of 2019. See the Prospect Mountain Construction Project page at Facebook for more photos and updates.