Cal Fire makes quick work of Mt. Diablo fire By KTVU staff A small fire broke out at the entrance to Mt. Diablo. MT. DIABLO, Calif. - A wildfire broke out early Friday morning at the entrance to Mt. Diablo. The fire was first reported at about 3:15 a.m., near Scenic Boulevard and South Gate Road. A KTVU news photographer at the scene reported the flames were moving slowly, but the rugged location made firefighting efforts difficult. Fire crews were able to get a handle on the situation in about an hour. The fire appeared to be approaching some structures, but firefighters did stop its progress.