NY 177 begins at interchange 42 on
I-81 in the town of
Adams. The route progresses away from the interstate to the southeast, passing the
former railroad station in Adams Center before intersecting with
US 11 in the center of the hamlet. At this intersection, NY 177 turns eastward, leaving the populated hamlet for a rural backdrop and into the hamlet of Honeyville. Honeyville consists of little more than a few houses centered on the intersection of NY 177 and Fuller Road. After leaving Honeyville, NY 177 intersects with
CR 155, where it turns to the southeast into the town of
Rodman. After crossing a creek, the route enters the hamlet of Rodman as a two-lane road through the southern end of the hamlet. During the stretch around Rodman, NY 177 intersects with
CR 85 (Creek Road) and
CR 97 (Washington Park Road / School Street) before leaving the hamlet. NY 177 continues winding itself to the southeast through the town of Rodman, as a rural two-lane highway. After Williams Road, the route makes several bends in to the south and east, straightening out eastward at an intersection with the northern terminus of
CR 95. This eastward progression remains stagnant as NY 177 continues eastward past
CR 189. After a short, empty stretch of roadway, NY 177 crosses the county line into
Lewis County, where it enters the town of
Pinckney. Through Pinckney, the route turns to the northeast, crossing Old State Road before bending and turning southeastward into the hamlet of Barnes Corners. In Barnes Corners, the dense forest retreats for a rural community, where NY 177 intersects with
CR 21 and
CR 2 (Seven-by-Nine Road). After leaving Barnes Corners, NY 177 returns to being the two-lane rural roadway, progressing southeastward through the town of Pinckney. Despite the rural scenery, the route does enter the hamlet of New Boston and the junction with
CR 23 (Liberty Road). Passing a few farms, the route turns to the northeast near Mile Square Road, and enters the hamlet of Bellwood, within the town of
Harrisburg. Bellwood consists of a few houses and an intersection with
CR 27 and
CR 28 (Sears Pond Road). Leaving Bellwood, NY 177 continues eastward into the hamlet of Windecker, which consists only of a few houses. Leaving Windecker, NY 177 bends to the southeast and enters the town of
Lowville, passing a few farms and wind turbines before bending into the hamlet of West Lowville. In West Lowville, NY 177 intersects with
NY 12, which continues eastward to the village of
Lowville. NY 177 terminates at this intersection. ==History==