This connects Turtle Rock Trail
with 700DA, from which you can access Impalement Trail
to reach the rest of Blair.
Look for the "Turtle Rock" sign on Turtle Rock Trail
, then go the way it doesn't point.
On the other end, you'll have to cross a sketchy weir. This can sometimes be impassible during high runoff so you may have to search up and down creek to find a way to cross safely.