A woman went missing on Memorial Day from the Sierra Nevada swimming hole God’s Bath, Tuolumne County sheriff’s officials said. She is at least the ninth person known to have drowned or been swept away in a California river since April. The disappearance was reported at 6:30 p.m. Monday. The 22-year-old Galt resident had walked to the Clavey River with a male companion and was last seen in the water at or near God’s Bath. Sheriff’s officials said it wasn’t known if she went in voluntarily or slipped. The search continued Tuesday and Wednesday with ground volunteers and a California Highway Patrol helicopter. Because the river is running fast and cold during the snowpack melt, it was deemed too dangerous for rescue swimmers and divers.