You are looking for a bison tube. This is a great area to find a cahce and carry out a little garbage. If we all do a little it will equal a lot.
Parking is almost right at GZ. Be sure to bring your pen so you can record your find.
Enjoy the search and be sure to make sure the container is put back exactly as you found it to prevent a water soaked log. Please no pictures that will spoil the fun for the next Geocacher.