At around 2 or so miles in, we passed where I'd maxed out at before and made it to the second falls, which proved to be one of the greatest challenges. Immediatly after getting past the falls, the path became substantially more difficult with brush filling in the entirety of the walkable area at the bottom of the canyon in most places.
We got to the point where we were walking on top of the brush. Even the dog could walk on top of it. At one point, a branch I was using to pull myself forward gave way and I took a good bath in the creek. Eventually we got to a point where we couldn't pass through it anymore without a machete or burning it down. I knew we were extremely close to the end of the canyon, but we couldn't make it. Oh well, by that point, we'd seen all of the good stuff. We climbed out of the canyon in one of the few dirt side canyons and hopped on the dirt road not far from the rim.
All-in-all, a good hike