PA 184 begins at an intersection with PA 287 in the hamlet of Brookside. The route progresses to the northeast, heading through the rural areas of Cogan House Township. PA 184 continuously winds through the woods before forming a short eastward pattern after the intersection with Corgi Cabin Lane. The highway clears of the woods and enters fields. There, the route turns to the northeast at an intersection with Harman Road, a dead-end street to a local farm. PA 184 passes a large patch of woods to the east and enters the hamlet of White Pine. In White Pine, the highway passes some residences and intersects with Lick Run Road, where the route makes an abrupt turn to the east through farms. At the intersection with Campbell Road, PA 184 turns to the north along the right-of-way of Campbell Road, while the original eastward route continues as Cogan House Road. Farms continue as the scenery for a couple miles as the highway heads north into the hamlet of Beech Grove. In Beech Grove, PA 184 makes several curves before heading eastward until the intersection with Taylor Road, where the highway turns to the northeast and enters the hamlet of Steam Valley. Through Steam Valley, PA 184 returns to the woods and starts passing numerous residences before entering the interchange with US 15. Midway through the interchange, the road reaches the northbound on-off ramps, where PA 184 continues north past a parking lot and terminates at Steam Mill Road.
History
PA 184 was first designated in 1928 on a different alignment between the intersection with its parent route, PA 84 in Brookside to Campbell Road. The route followed the current-day alignment of Cogan House Road. Four years later, PA 184 was paved from Brookside to Campbell Road and from the intersection with Edwards Road to US 15 in Steam Valley. In 1989, the route was realigned onto its current alignment through Beech Grove with that was repaved by the Pennsylvania Department of Transportation. In the winter of 2007, the Department of Transportation announced the construction of the new interchange between US 15 and PA 184, as part of the construction to upgrade US 15 into an interstate highway. The total cost for the portion from Trout Run to Buttonwood was to be $71 million. Early plans were to build an interchange south of PA 184, which would mean that southbound travelers would have to backtrack to access local businesses. Per a suggestion by the Fry family, owners of a local restaurant, the design was changed to realign PA 184 to the north and build a full interchange. As a result, a few homes belonging to members of the Fry family would be in the way of the new roadways, and the buildings were moved to nearby family-owned land. The project was completed in the fall of 2009 with a ribbon cutting ceremony on the southbound lanes.
