THIS CACHE IS NOT AT THE POSTED COORDINATES.
To find this cache, you will need to complete the Oak Grove, Oregon Adventure Lab. The Adventure Lab will take you on a short little tour of a few important spots in Oak Grove, Oregon. You can walk to some of the spots, but all of them are easily accessible by car, and takes about 30 minutes or less to complete. Each journal entry of the Adventure Lab will provide you with information you need for the final coordinates of this bonus cache. You will need to get numbers from each journal entry to get the final coordinates.
Final Coordinates are N 45 (ICH.OG) W 122 (W.HH). There are 5 journal entries in the Adventure Lab, 4 of them will give you the numbers you need, and 1 will give you the hint to the cache. Once you do all 5 stops, the letters in the final coordinates will make more sense.
Enjoy!