You don't want to take the road from Calico Rock to Mt Olive.  Your map APP may send you that way, but it is a gravel road with low clearances.  Only travel to Mt Olive Mercantile from Arkansas Highway 9. 

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Watch for this sign on Hwy 9 North toward Melbourne (at 8 miles) or Hwy 9 South toward Sylamore/Mountain View (at 10 miles).  We are 4.6 miles on the left down the Mt Olive Road.  Use the second driveway to enter the park, past our sign and Mercantile store.