The Upper Perry Arch Bridge
The Upper Perry Arch is a 312'-long bridge with a main span comprised of a 134'-long reinforced concrete rib deck arch over the Grande Ronde River, and a 175'-long concrete viaduct crossing over the Union Pacific Railroad corridor.
Decorative features include open spandrel arch with arched fascia curtain walls, bush hammered inset panels and small arched openings in the balustrade railings.
The structure was designed by Conde McCullough, and it is comparable in size and ornamentation to a number of deck arch bridges located on the Oregon Coast Highway, the Pacific Highway, and elsewhere.
The Cache:
The location coordinates should put you to an information sign about this bridge, you are looking for two dates:
1. Original bridge construction by the Union Bridge Company of Portland happened in what year? that the last two digits of that year, that number is AB
2. When did Conde McCullough become ORegon State's bridge engineer? that the last two digits of that year, that number is CD
Final Stage at: N 45 21.1AB, W 118 10 2CD
Should be an easy find, so walk around, stretch those legs, and have fun.
FTF congrats goes to eastor1973, thanks for playing and making the find