Start at N46° 37.836 W123°13.931
Your first waypoint is N46° 37.836 W123°13.931. You are going to want to get the year off of the bridge. Then subtract 1201 from the year and that will = XXX
Your Second waypoint will be at N46° 37.919 W123° 13.956.
You will need the newest year on this sign. Then you will subtract that year from 1934. This number will = Y
Now you need to head to the parking area by the highway. Here you will need to count the moss covered cement pier blocks. You will then add 3 to this number to give you = ZZ
Your checksum is: 783
You final waypoint is at: N 46° 37.XXX
W123° 13.YZZ
It is here you will locate the cache. Happy Hunting,
and take the spoiler picture just in case, you never know.