NY 30 begins at an interchange with NY 17 in the town of Hancock adjacent to the confluence of the East Branch of the Delaware River and the Beaverkill River. The route follows the East Branch northeast to Downsville, where it meets NY 206. NY 206 follows NY 30 across the East Branch into Catskill Park, where the routes split near Brock Mountain. NY 30 exits the park, runs along the south side of the Pepacton Reservoir, before crossing over to the north side of the river. Near Margaretville, NY 30 briefly overlaps NY 28 before turning northward toward Roxbury, where the route passes the John Burroughs Memorial State Historic Site. New York Governor David Paterson designated the stretch of NY 30 within Delaware County the David C. Brinkerhoff Memorial Highway, after the New York State Trooper who was slain in pursuit of Travis Trimm near the village on April 25, 2007.