One fire, which burned about 2 acres, was reported just after 12:30 p.m. along the highway west of Alhambra Avenue, according to CHP Officer Marc Johnston. That fire prompted the closure of one westbound lane.
A Contra Costa Fire Protection District dispatcher said the blaze was controlled by 1:15 p.m., but that firefighters are still in the area conducting overhaul.
A minor-injury traffic collision was reported on the highway near that fire, said CHP Sgt. John Carman.
Fire crews also put out a small fire near Morello Avenue that started just minutes before the fire near Alhambra Avenue, the dispatcher said.
A Sig-alert was issued for the area at 1:05 p.m. and canceled at 1:55 p.m.
