When you hike up the hill at the top of the steep 4wd road then you have to cross a shallow drainage before you get to the easy side-drainage entrance to Poison Creek just before the top of the good part. Best I can tell, you are taking about this shallow drainage and I'm not sure whether you are intending to ask about it specifically or if you found it and thought you were at Poison Creek. That shallow drainage does drop out into a technical section. If you descend that shallow drainage then please post back or PM me. I'd like to hear what is there. I've scouted the top a little, a long time ago. There is a bolt at the top of the first bypass-able drop while the drainage is still headed north just before it cuts to the east.