This cache is part of my serie of caches with GeocacherMV that are based on the movie back to the future.
To find this cache, you have to travel back in time to the wild west to find a number on the plack on the ground and solve for the last three digits. To find the final you'll have to use math. For the North coordinate, add 126 to the number on the plack that is in front of the bench, and for the West coordinate, add 357 to the number from the plack. to make sure you have the right coordinates, the sum of the final three digits is 557.
The final is within walking distance. Good luck. Happy cahing.