Get ready for an ultramarathon-distance open water challenge on Sunday, July 12, 2026, swimming approximately 11 miles through downtown Portland along the Willamette River's east side. You'll start at Sellwood Riverfront Park and finish at Cathedral Park after passing under all 12 of Portland's iconic bridges, with water temperatures ranging from 66–74 degrees Fahrenheit. The event kicks off at 7:30 am with a 3:30 pm cutoff time, and you must be at least 18 years old to participate.