A fire that broke out west of Shasta Lake City Thursday is under investigation. It started at around 2 O’clock off Ruby Lane and Duvall Drive, which are off Lake Boulevard north of Shasta Dam Boulevard. Cal-Fire had estimated it at 7 acres but after more accurate mapping they say it burned 4 acres. It also destroyed two outbuildings and damaged four homes. Crews spent the night at the scene mopping up.