Thought I would bump this since it is getting close. Seems like the SW is the place to go. The wifey pulled a Salt permit so I know what we are doing for part of our spring break. What else in the Class IV range is fairly close? Gila? Verde?
N Cali has been great for spring trips. Catching the last of the rainy season / first of the runoff in the Kalamath drainage is great. All classes of runs: N, S, main cal salmon; trib creeks: Clear, Indian, Panther, Scott R. Smith R and it's forks is just north and might catch Trinity, Sac, McCloud on the way up or back! Even a pretty (long) drive out.