Pumphouse wave sits inside the Gore Canyon Whitewater Playpark on the Colorado River, just above Boat Ramp #2 at the BLM's Pumphouse Recreation Area in Grand County. It's a man-made feature built mainly with kayakers and paddleboarders in mind, so don't expect it dialed in purely for surfing — it comes and goes with flow and is only occasionally rideable. Spring and early summer runoff give you the best shot at catching it in shape before levels drop off for the season. The payoff for timing it right is a busy BLM campground right at the put-in and easy access off Trough Road, so you can camp, paddle, and check the wave without much of a mission.