Half of the Capital Beltway’s outer loop is likely to be blocked most of the day while workers inspect and repair the Forestville Road bridge, which was hit by a dump truck, the Maryland State Highway Administration said this morning. The ramp from the inner loop to Forestville Road also is closed and so is Forestville Road over the Beltway.

Northbound traffic on I-95/495 near Andrews Air Force Base in Prince George’s County was backed up for miles during the morning rush, and delays almost certainly will continue until the lanes reopen. That may not be until this evening, the highway administration said.

I-95 drivers coming up from areas south of the Springfield Mixing Bowl and heading for destinations north of College Park could take the Beltway’s inner loop heading west toward Tysons Corner and the American Legion Bridge. It’s about the same distance around to the Beltway’s junction with I-95.

For those who can’t do that and must be on the eastern side of the Beltway, the highway administration has two detours for Forestville Road traffic.

Drivers on the outer loop must use Exit 7 for Branch Avenue (Route 5) and turn left to Silver Hill Road (Route 458) then turn right onto Suitland Parkway to Forestville Road.

Drivers on the inner loop must use to Exit 11 for Pennsylvania Avenue (Route 4) and turn right to Forestville Road/Ritchie Road.

The highway administration said drivers northbound on the outer loop should consider using Allentown Road (Route 337) to the Suitland Parkway to westbound Pennsylvania Avenue and back to I-95.