Big Sur lights up on the Colorado River near Cameo, just upstream from Palisade, where a cement abutment under the I-70 bridge throws up a standing wave big enough to surf. It only works at high water—think around 20,000 cfs—which usually means coordinated reservoir releases timed to help endangered fish through the Grand Valley, so this is strictly a runoff-season spot. Access is easy as river waves go: follow the "Parking Area" signs off I-70 near the Grand Mesa/Powderhorn exit, then walk downstream under the bridge about a hundred yards. The Class III water here calls for solid intermediate skills, and since dams and the interstate box in the reach above Palisade, this is a drive-up stop rather than part of a longer paddle.