Course is chiefly flat, although there are a few bridge crossings; save your strength. Wind from the river between about Mile 17 and 22.5 is devastating. Well-supported.
Mile markers inconsistent. The marathon's host hotel is the Shilo Inn, which is not a good selling point (it is a dump and customer service is atrocious). The course begins and ends there.
Do not stay at Shilo Inn; there are other options within a very reasonable distance.
2 /
5 Stars
By DMH about 2015
Review
Great venue, flat, fast scenic course along dedicated path around the Columbia River. Very well managed marathon, much better than other smaller marathons I've run.
Race Tips
Can be cold at start, rarely wet, but can be breezy so work with the wind when you can.
5 /
5 Stars
By ES about 2013
Review
Smooth flat course. Bridges serve as landmarks for next goal.
Race Tips
I just took a relaxed pace and achieved PB. No breakdowns.