UPDATE: All lanes are open.

INITIAL POST: A rollover collision on westbound State Route 16 at the east end of the Tacoma Narrows Bridge is blocking the left lane, according to the Washington State Department of Transportation at 4:34 p.m. WSDOT traffic cameras show vehicles backed up to at least the South Union Avenue ramp.

One vehicle carrying a 25-foot travel trailer was involved in the collision, and there is minor injury, Washington State Patrol Trooper Guy Gill said.

This is a developing story. Check back for updates.