It is the
access road location for the cache series.
In order to find the Final Cache which is an ammo box, you will need to visit the first 3 caches in the 4th Anniversary series. One of the containers will have the coords on the log sheet to the final location for this cache.
There is a commemorative magnet for the FTF, STF, and TTF finders of the cache. There are also 7 more magnets for the next 7 finders as a memento. I hope you enjoy this series placed for your caching pleasure. Have fun.