A simple multi at side of a river. Can be quite peaceful down here. Nice place for a little stroll.
At the given location there is a board with the information you require.
The cache can be found at N53 41.ABC W001 4D.EFG
A - last digit of the phone number
B - second digit of the 3 digit bridge number
C - second digit of the phone number plus the fifth digit
D - third digit of the 3 digit bridge number
E - third digit of the phone number
F - second digit of the phone number plus the seventh digit
G - eighth digit of the phone number minus the last number minus the fifith number
You are looking for a bison