Don't take our word for how good it is on the Trinity. Per the Forest Service's website:
"The Trinity is legendary for its salmon and steelhead fishing by drift boat or walk-in riverside spots, as well as for trophy brown trout. Chinook salmon are the most sought-after gamefish in the Trinity River system. Spring-run salmon begin to enter the river in May and provide trophy fishing through November. Although brown trout are not native, they were heavily stocked until the late 1970s. Today, a self-sustaining population remains in the upper river, providing fly and bait fishing. Species Present: In the Trinity River above Trinity Lake, there are Rainbow and Brown Trout. In the Trinity River below Lewiston Dam, there will be Steelhead (summer and winter runs), Chinook (spring and fall runs), Coho Salmon and Brown Trout."