Permitted by Army Corps
At the listed coordinates you will find a sign - with info from the sign you can get the final coordinates of the cache below:
The final is at:
N39 29.0(A+B+C)0 W84 03.84(B+C)
Where
"Built in 1921 at a cost of $A,BCD.00... Check sum (A+B+C+D=13)
The final cache is a magnetic coverplate behind the corner under cover about head high.