To get to this area, you exit west off of I-5 after Weed but before Gazelle. I forget the name of the road, but you can look it up! It takes you up the mountain to the west of Weed and past many residential areas up there. It becomes a scenic highway that eventually connects with SR 3 somewhere over near Trinity Lake. It is a beautiful drive. There is a snowdrift every spring at the top of this road, just near the junction with the Pacific Crest Trail. If you come too soon, you won't be able to make it up there. If you want to do this hike anytime prior to June 15, you may want to inquire as to road conditions.
There are very nice campsites at lower Deadfall. upper Deadfall is a big lake with lots of space. You can continue up the trail, sometimes steeply to another lake (no fish) and on up to the Mt Eddy trail. This is a beautiful hike with great views from the top of Eddy. We saw ambitious folks making this entire route to the peak and back to the parking lot a day hike. Vigorous.