At the posted coordinates is a historical plaque. Use that plaque to get the final coordinates for the cache.
For the purposes of this cache, the first line of the sign's description starts with the word "Reflecting"
The final cache can be found at N 33 08.ABC W 97 01.XYZ
A = Second digit in the year in parentheses at the bottom of the sign
B = Number of letters in the fourth word of the 10th line of the sign's description
C = Last digit on the sign
X = Number of letters in the first word of the 8th line of the sign's description
Y = Number of letters in the fifth word of the 1st line of the sign's description
Z = Number of letters in the last word of the 6th line of the sign's description