Work By The Virginia Department Of Transportation To Repair A Sinkhole On Interstate 81 In Washington County Has Wrapped Up With All Lanes Now Open. VDOT Spokeswoman Michelle Earl Said The Sinkhole Just Beyond Exit 13 Was 20 Feet Deep And 13 Feet Wide. Wet Weather Appears To Be The Reason The Sinkhole Developed. At One Point, Traffic Was Backed Up For A Mile.