On the left coast, W.E.T. River Trips are just waiting to help you navigate the South Fork of the American River near Sacramento. The water flows the fastest after strong rains pass through the area, so the recent winter weather is probably helping things out a bit. If you’re a more experienced rafter, or just a little crazy, they’ll take you out for a trip on the North Fork of the river. Since this section is filled with Class IV+ whitewater, you’re almost guaranteed a free swim. A one-day trip will set you back about $125, depending on the river, and if you want some lunch.
Over on the east coast, Blue Heron Whitewater is offering a similar chilly experience. The guides are taking out groups of adventures anytime there’s interest, and they’ve been pretty good about chronicling some recent trips on their blog. Here you’ll navigate the waves of the French Broad River near Asheville, North Carolina. Of course the water is cold, but at least the river won’t be crowded. Full day trips here are a little more affordable, running about $60 for the day.