UPDATE as of 9:27 p.m. The ramp has reopened, according to WSDOT.
INITIAL POST: A rolled-over semi is blocking the ramp from westbound state Route 512 to southbound Interstate 5, according to the Washington State Patrol.
No one was injured in the accident, the State Patrol said.
The accident that closed the ramp happened about 4:15 p.m., according to the Washington State Department of Transportation.