An overturned big-rig closed both directions of state Highway 121 in unincorporated Napa County on Monday afternoon, California Highway Patrol officials said. The crash was reported at 3:35 p.m. at Highway 121 just north of Wooden Valley Road. Vet in California Attack Had Trouble After Return From War A big-rig carrying 20 tons of dirt overturned, CHP officials said. Napa County sheriff's officials said Highway 121 will be closed until about 6 or 7 p.m. and they're asking drivers to use other routes. Guardians of Yountville Gunman Say He Sought Their Help A Sig-alert was issued at 4:01 p.m. because of the closure.