The System Trails that enter side canyons have some nasty drops. The ones that don't (like Cow Tank) are worse. I don't have pics, but I've seen that pouroff from the Gulch and recall deciding I'd gone as far as I was going to get. One of my references describes it as an impassable 25' pouroff, and that book does not describe many other obstacles too nasty for me as being impassable. Have you looked at Step Canyon? That one isn't described as impassable, but it's really only feasible with a rope if the logs or ladders aren't there.