SR 84 begins at the top of Allegheny Mountain, which coincides with the Virginia – West Virginia state line and the Eastern Continental Divide. The highway continues west as WV 84, which descends the west side of the mountain to its terminus at WV 92 in Frost. The state highway passes through a pair of hairpin turns as it descends to Townsend Draft. At the draft's mouth at Back Creek, SR 84 turns north and follows Back Creek to Mill Gap, where the highway turns east and follows East Back Creek through its water gap between Little Mountain and Lantz Mountain. The state highway turns north and follows the valley through the hamlet of Mill Gap to Meadowdale. There, SR 84 turns east and follows the Jackson River through Vanderpool Gap between Monterey Mountain and Back Creek Mountain to its eastern terminus at US 220 (Jackson River Road) in the hamlet of Vanderpool south of the Highland Countyseat of Monterey.[1][2]
^State Highway Commission of Virginia (August 29–30, 1923). "Minutes of Meeting"(PDF) (Report). Richmond: Commonwealth of Virginia. p. 195. On the morning of the 30th, the Commission proceeded to Monterey in Highland County where a public hearing was given for the establishment of the Route between Monterey and the West Va. Line. The two routes under consideration were, one by Hightown to the top of the Mountain and the other in the direction of Frost.
^State Highway Commission of Virginia (October 23–25, 1923). "Minutes of Meeting"(PDF) (Report). Richmond: Commonwealth of Virginia. p. 207. Moved by Mr. Sanders, seconded by Mr. Truxtun, that the location of Route No. 39 from Monterey to the West Virginia Line be from Monterey down the valley of Jackson River to Vanderpool Gap, thence through Vanderpool Gap to the valley of the east branch of Back Creek, thence down the east branch of Back Creek to Mill Gap, thence through Mill Gap to Back Creek valley, thence down Back Creek valley to Warwick Run, thence up the valley of Warwick Run to the West Va. Line near Frost. Motion carried.