UPDATE, 4:54 p.m.: Star reporter Kym Kemp calls in from the scene! Both northbound lanes open at this moment, she says. One southbound lane open, one closed. The CHP is reporting that everything should be cleared very soon. — Hank

UPDATE, 3:47 p.m.: Both the CHP Incidents page and the Caltrans Road Information page say that 101 is now closed to northbound traffic. You gotta take the Avenue. The CHP says that the closure is expected to last two hours. — Hank.

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UPDATE, 2:55 p.m.:Myers Flat Businessman Jim Hensley advises travelers to use Avenue of the Giants.  He says, “The 101 is closed SOUTH of MYERS FLAT.—-A hazardous material truck collided w/ a van and closed 101. Take the hwy.254 ( AVENUE of the GIANTS.) from Miranda in the SOUTH and MYERS from the North.”

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A semi and a SUV or sedan collided by Myers Flat at about 1:30 p.m. A load of lumber has completely blocked the northbound lanes. There is one-way controlled traffic using the southbound shoulder. There are fluids on the road. More details as they are known.