Crews are battling a wildfire west of the Don Pedro Reservoir in Tuolumne County.
According to Cal Fire, the fire started shortly before noon on Wednesday by Bonds Flat Road and La Grange Road.
As of 2:15 p.m., the fire had burned 500 acres.
Cal Fire spokesperson Daniel Berlant told FOX40 that the “59 Fire” was originally three smaller fires that merged.
It was not immediately known if any structures were threatened.