You can only reach this final with some sort of floating vessel, because the the final is attached in the middle of the creek.
The starting coords listed will take you to the bridge that crosses the creek. There is an 18"X18" plaque attached to the bridge. Find the plaque and use the information to get you the final location. A word to the wise, I suggest using whats listed on the plaque because if you look it up on the internet, it may not match whats on the plaque depending on your source.
A= Number of letter in the very first word minus 2.
B= The first number in the year minus the fourth number in the year.
C= The number of letters in the second word on the plaque.
D= The number of letters in Charles last name minus one.
n33 33.6AB
w88 18.8CD