Blue John, Main fork with Brian and 3 others.

Main Fork - one mile of the main fork forms a deep, narrow canyon, and a quarter of this is a dark slot. The upper end descends steeply, by 100 feet over a distance of about 200 feet, so is easiest to explore in the downstream direction though even here a rope may be needed.

Since the party was large enough different groups went down different sections.  4 of us decided to try the main fork.  Very tight slot canyons, dark the the last part so dark that we would have to down climb into black.  It was decided to go back.  There is not a way out of this slot canyon.  We would have to make a human pyramid so the guy on top could get out.  Tied the rope to some rock to let the rest of us out.