This cache is NOT at the posted coordinates.
To find this cache, you first need to complete the Take Refuge! Adventure Lab (http://labs.geocaching.com/goto/TakeRefuge). The adventure lab takes you on a tour of the Tualatin River National Wildlife Refuge, which is open every day from dawn until dusk. The last journal entry of the adventure lab provides you with the final coordinates for this bonus.
This bonus cache is NOT located on the premises of the Wildlife Refuge, but it is nearby. Please follow all the rules of the Wildlife Refuge as you complete the Adventure Lab: no dogs, bicycles, or jogging/running on the trails.
BYOP