Industrial Hole is a fickle, big-volume wave on the Columbia River just outside Trail, British Columbia, near Rock Island, that only shows up in years with a heavy snowpack and a fast melt. It's surfable roughly between 8 and 11 meters on the local gauge, with 10.2 to 10.4 meters the sweet spot—a big green-faced wave with a foam pile on the left and a clean shoulder on the right. Below about 8.8 meters the river-right side turns into a genuinely dangerous retentive hole, and the paddle out crosses real whirlpools, so this is experienced-surfer-only water. Bring a stout board (locals recommend a 5'10" river board) and solid whitewater self-rescue skills before you go.