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There are a mess of grades and whatnot just east of Arlington. I am not going to dig into all of it now, but will return to it later, hopefully while preparing for some field work sorting it all out! Until then, here's Steve's note, my map, and a few relatively unhelpful photos of the area.
600 feet, MP 147.0, Between UP and the River
A hint of a possible grade east from Columbia St., but probably natural...
It looks a little more suspicious from below...
Looking up from the westbound exit ramp...
No pavement sticking out?
Below the exit ramp...
Just east of the exit ramp...
Arlington, Oregon. May 17, 2014Photo by A. F. LittLooking east at the exit ramp...