A group of fires near the Sunol Regional Wilderness and the Calaveras Reservoir have burned more than 1,700 acres and still had zero containment Monday morning, according to Cal Fire.
Firefighters with the Alameda County Fire Department, Cal Fire and departments in Oakland, Fremont and Livermore-Pleasanton began battling the blaze, called the Marsh complex, on Sunday.
As of 8:25 a.m. Monday, 1,775 acres had been burned, according to Cal Fire.
Authorities believe weekend lightning strikes sparked the fires, which were first reported around 1:30 p.m. Sunday near the reservoir.
The fires forced the evacuation of about 10 homes along Welch Creek Road, located about four miles southeast of Sunol and one mile north of the Little Yosemite Trail area.
Updated information about wildfires across the state can be found here.