Where's The Bison? Traditional Cache

Please use the utmost stealth around the disk golfers!
And please close the container tight to ensure dryness.
No hint on this one. Description shall be enough. Good luck!

This shouldn't be too hard to find, but I'll update the difficulty as logs come in.
 

PARK INFO:
The gate admission fee of $1.50 per person is charged on Saturdays, Sundays and designated holidays (children 5 and younger are free); $8 maximum charge per car or van (nine or fewer occupants). The park is open daily from 8 am to 6 pm. During Daylight Saving Time, the park is open daily until 7:30 pm.