I-88 continues east to Harpursville, connecting to NY 79 near the center of the community at exit 6. Shortly after meeting NY 79, I-88 reenters a river valley, this time that of the Susquehanna River. I-88 heads to the northeast, following the river and NY 7 to Afton where it has an interchange with NY 41 exit 7. It continues to Bainbridge where it meets NY 206 and then on to Sidney, where it meets NY 8, the primary north–south road through the village, at exit 9. From Sidney, I-88 progresses northeast through southern Otsego County. It passes Unadilla, accessed by exit 10, then connects to NY 357 at exit 11. The expressway continues and reaches exit 12 which connects to Otego via NY 911J. It continues northeastward before entering Oneonta. Within the city, I-88 interchanges with NY 205 ahead of exit 14 with Main Street, which is the former routing of NY 28. The next interchange I-88 intersects NY 23 and NY 28 joins the expressway, following I-88 out of the city. Oneonta to Schenectady Northeast of Oneonta, NY 28 leaves I-88 at exit 17 to follow the Susquehanna River northward toward Cooperstown. I-88, however, remains on a northeasterly track through rural eastern Otsego County. Upon crossing into Schoharie County, I-88 begins to follow an easterly routing as it heads toward Cobleskill. While NY 7 enters the village, I-88 passes south of it, connecting to the village via two exits with NY 7. East of Cobleskill, I-88 interchanges with NY 145. Howe Caverns, a regionally popular attraction, is located a short distance north of the exit. I-88 continues onward, skirting the northern edge of Schoharie before passing into Schenectady County. Shortly after entering Schenectady County, I-88 meets US 20 east of Duanesburg. Past US 20, I-88 continues northeast, interchanging with NY 7 for one final time before ending at the New York State Thruway (I-90) in western Schenectady. History The 1956 National System of Interstate and Defense Highways Act did not include I-88. New York state officials pressed for addition of the route, and funding was included in the Federal-Aid Highway Act of 1968. Right-of-way acquisition started immediately afterward, and I-88 was added to the Interstate Highway System on December 13, 1968. As originally planned by the New York State Department of Transportation (NYSDOT), I-88 would begin at I-81 in Binghamton and follow the proposed Susquehanna Expressway to Schenectady,