UPDATE as of 1:56 p.m.
All lanes are now open.
UPDATE as of 12:58 p.m.
One lane of eastbound SR 18 is open at C Street and ramps to eastbound SR 18 from SR 167 are open. The northbound and southbound SR 167 off-ramps to east SR 18 are closed.
INITIAL POST: A collision on eastbound state Route 18 in Auburn is blocking all lanes, WSDOT reports.
The crash happened at 12:11 p.m. at C Street (milepost 4).
State troopers and paramedics are on scene.