Hello Sub,
The mumford bar trail has a dickens of a lot of switchbacks on it but it is an easy trail to hike, assuming the hiker is in reasonable condition. It is among one of the easiest trails along the NFAR.
I think it was the 2008 or 9 fire that burned the area and took out the forest to the tops of the trees. This has allowed the sunlight to reach the forest floor making the weeds Plentiful as well as 6' to 8' tall. Just before the trail reaches the river the weeds are especially bad, thick and tall, at least that is the way it was the last time I hiked it ~2010.
There is the remains of a log cabin next to the trail, after you get past the weeds, with a spring running past it, maybe not now though, with a very large apple tree ~ 100' from the cabin to the right. The trail down the river side wall is steep, to the right of where the spring goes over the sidewall. This year as the water flow is ~ 30 CFS right now (take that is being extremely low and filled with algae) one will have an easy time of crossing the river anywhere. It will be very wise to filter or treat the water Before drinking it!
Just down river from where the trail comes down, say 100 yards down river, will be a small waterfall and pool. at that point the river turns into a solid rock wall gorge as it heads down to the Italian Bar Trail, a slipper but interesting hike down the river. A hard rock mine exists on the right side as you are going down river.
Up river from where the trail comes down to the river, say about 3/4 of a mile on the trail, the river makes a nice curving bend around a solid rock outcropping/hill thingy. Again, the weeds may have taken command of the trail along the canyon floor so you may need to hike the river. I would recommend a solid hiking staff be used when hiking in the river as slipping and falling is not good for a persons bones.
There is a huge amount of country in the NFAR canyon with side canyons galore, a huge amount of mining history every where and if you've not noticed the comments, there are a LOT OF BEARS IN THERE!!!!! I carry a heavy duty revolver with me whenever I go in on the NFAR and have had to use it as a noise maker which it does an excellent job at. Usually the bears will leave and not come back after hearing that thing go off.
If you will be in there for several days I would recommend putting your food up on a steel cable over a high tree limb so the bears can not get at it or chew through the cable, the easily chew through nylon parachute cord and I've a LOT of experience with that. The steel cable has never failed to keep the bears away from my food. If you will be sleeping in a tent, leave it unzipped during the day so the bears can go in to it without needing to tear it open.
Best of luck..........................63bkpkr