NY 73 begins to descend in elevation, while CR 51 splits off and NY 73 heads into Keene. After crossing the East Branch of the Ausable River, NY 73 merges in with NY 9N. The two roads continue to drop in elevation, passing and circling mountains as they head along. After Norton Cemetery, NY 9N splits off to the east and NY 73 continues southward. NY 73 now runs along the East Branch, intersecting with county and local roads as it heads southward.