Terminal Condition Traditional Cache
CrawlOver: It had a good run. The cache may still be there; if someone wants an ammo box go get it.
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Near the Union Arch Bridge, the world's largest single arch masonry bridge built in 1857 by the US Army.
This area was once part of a vital piece of Washington infrastructure, now long-defunct.
Follow the man-made terrain features in this area and see if you can figure it out. Walk in the tracks of time and history.
A surviving structure can be found at: N 38 58.336, W 077 08.710.
Can you guess what it is that was here? Its successor lies deep underground.
Additional Hints
(Decrypt)
"Fghzcrq?" Gnxr n "cbyr." Lbh jvyy fbba frr gur "hgvyvgl" bs gur uvqr fvgr.
Frr uggc://jjj.qpgebyyrl.bet/qpfgerrg.ugz sbe zber pyhrf.
Treasures
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