B trail is a somewhat technical singletrack trail on the north side of Big Chico Creek coming off of North Rim and connencting to either Middle Trail or Upper Park Road. After dropping off North Rim it rolls north-east for approx. 1/2 mile before dropping down some steep switchbacks into the trees on the way to Upper Park Road. This is an advanced level trail that makes for a very fast and fun decent. Approx. vertical gain/loss is 500ft. This trail is usually combined with North Rim and Middle Trail to make a loop of approx. 9 miles.
*B Trail is the trail in orange in the above map.