Yes - in Cow Tank Conyon, about 1 km up from the junction with Grand Gulch , as described in multiple sources the pour-off is not passable (going up or down the pour off) without canyoneering it. I would like to see some photos of this obstacle - and maybe one or two folks have some photos from belo...

In [ Grand Gulch - Collins to Bullet ]
You got as afar as Cow Tank Ledge (pour off) - could you please send me a photo of it - if you have one.