The first part of the gorge section is where our friend John Sullivan was killed about 14 yrs ago, RIP.
It takes awhile to get through. Camping right above the gorge or portaging it all together are recommended. There's a municipal building river right up the hill at the start of the gorge. There you can hire horses for 10,000 clp a day and horse and cowboy for 15,000 clp a day to assist in the portage river right.
Much easier logistics to just start on the Manso day commercial section, lower than Alerce section, and go in that way. Tough shuttle logistics though.
Some of the biggest fish I've ever seen in that gorge. Nobody there fishing.
Good job making it out safely.