Calfire spokeswoman: Blaze in far Northern Calif. destroys 30 structures, many of them homes

A wildfire in Northern California's Shasta County has damaged 30 structures, many of them homes, and is threatening another 350 structures.

The wind-whipped Clover Fire near the rural community of Happy Valley has grown to more than 11 square miles.

State fire spokeswoman Teresa Rea says the blaze began around 1 p.m. Monday and quickly burned through grass and oak. Happy Valley is about 150 miles north of Sacramento.

Multiple outbuildings and vehicles were damaged in addition to the homes. Mandatory evacuations are in place for some homes, though Rea didn't know how many.

Rea says fire crews did make good progress against the blaze overnight, raising containment from 5 percent to 40 percent.

More than 1,100 firefighters are battling the blaze. The cause is under investigation.