The previous route of the A.T. that included the footbridge is closed and a temporary re-route has been marked with white blazes as of September 18. The A.T. footbridge has been deemed unsafe by U.S. Forest Service engineers. You wouldn't know to look at it - it's a little askew, but looks sound enough - but one of the main support stringers has a major crack in it, according to Kathryn Herndon in ATC's Central/SW Virginia regional office.
Here is the full description:
(9/18/19) Trail Closure & Temporary Re-Route near Dickey Gap (Mount Rogers National Recreation Area)
The Appalachian Trail (A.T.) footbridge over Comers Creek is unsafe due to a structural fault and will be removed. The previous route of the A.T. is currently CLOSED for two miles, until a safe crossing of Comers Creek is established. The closed section is between Comers Creek Road/VA-650/Dickey Gap and the junction with the Dickey Gap Trail.
A temporary re-reroute of the Appalachian Trail (now following VA-650/Comers Creek Road, the Hurricane Campground Road, and Dickey Gap Trail) has been marked with white blazes and is the official route of the A.T. until the closed section is re-opened. Directions are below.
SOUTHBOUND
Starting at Dickey Gap A.T. trailhead, mile 520.1 (near the junction of VA 16 and VA 650/Comers Creek Road):
Turn RIGHT on gravel Comers Creek Road (VA 650), away from paved VA 16. Follow the gravel road for 1.5 miles to the paved road opposite Hurricane Campground. Turn LEFT on paved road opposite Hurricane Campground, and follow it for 0.3 miles. Look for the wooden signpost for the Dickey Gap Trail on your left. Turn LEFT onto Dickey Gap Trail and follow it 0.4 miles to where it ends at the A.T. junction. Turn RIGHT to continue southbound on the Appalachian Trail.
NORTHBOUND
Starting at A.T. junction with Dickey Gap Trail, mile 518.1 (please note wooden signpost at the junction reads "Hurricane Campground 0.4 miles" but does not say "Dickey Gap Trail"; also, note some sources refer to this trail informally as the “Hurricane Campground Trail.”):
Turn LEFT on the Dickey Gap Trail. Follow Dickey Gap Trail 0.4 miles until it ends at the paved road opposite Hurricane Campground. Turn RIGHT on the paved road and follow it for 0.3 miles until it ends at Comers Creek Road/VA 650, which is a gravel road. Turn RIGHT on the gravel road and follow it for 1.5 miles until you reach the A.T. near the junction of VA 650 and paved VA 16. To continue northbound, rejoin the A.T. on the same side of the road as the parking lot and information kiosk.
You can find this and other updates on the Appalachian Trail Conservancy's website at www.appalachiantrail.org/updates.