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This is very much a kid friendly cache that some of the younger ones can solve themselves.
At the listed coordinates find the info to locate the final stage which is at
A=Lilium x 'Garden Hybrids'
B=Artemisia 'Powis Castle'
C=Achillea x 'Moonshine'
Inside the log book you will find the coordinates for CCC BONUS GC18YEK
Most of the area around Clackamas Community College, including the walking trail, is dog friendly. As always you are asked to take with you whatever your dog leaves behind.
However the final cache site is in what is considered a nature area and dogs are not allowed. Instead of dogs you are likely to see rabbits, squirrels, pond turtles, and any number of types of bird. There is even an astonomical observatory on site. While visiting the area be sure to read some of the history of what the land was and how it got to be what it is today. The area has seen better days, but maybe all it needs is a few volunteers to bring it back to the oasis it was just a few years ago.
(No hints available.)