The East Fork of the Carson flows with the melting snow, and heads east down the Sierra Mtns, into Nevada. It's a class II+ run, but moves quickly. We did a trip a few weeks, with the great folks from Current Adventures (http://currentadventures.com) who do lessons and trips all over northern california. (full disclosure, I work for CA some). We tagged along on the trip. The rapids were fun, the scenery was great, the food was yummy, and the company was wonderful. Highly recommend trip.