This is a famous and fun “intermediate - advanced” trail at Bass Lake. See the description and video for “007 First” at this link from Pedal Forward Bike Shop (scroll down until you see 007 First):

007 Trail description

There are safe ways around the more difficult sections and we’ll have groups going at different speeds based on ability.

Meet at the intersection of Rd 274 and Central Camp Rd, park on the right as you come down Rd 274 (see the parking spot marked on the map in link above)