The course consists of a 5.2 mile loop, all on single-track trails. The course is entirely flat, on trails adjacent to the Willamette River. Most sections of the course are wooded, and a few stream crossings (5-10 meters long and less than a foot deep) are possible, depending on the water level of the river. The 50K will cover the loop 6 times, the 25K will cover the loop 3 times, the 10M will cover the loop twice (yes, that makes the distance 10.4 miles), and the 5M will cover the loop once (actually 5.2 miles).

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