They are on Hwy 289 between Ash Flat and Mammoth Spring in Saddle, Arkansas!
It's worth noting that if you use internet directions through map programs you might get a route an hour out of the way!
From Memphis, take the I-55 N to Hwy 63 N towards Hardy. Turn left at Hwy 62 towards Ash Flat (about 9 miles) then you will pass a Super Walmart on the right. Stay in the right lane and remain on Hwy 62. At the junction of Hwy 289 N turn right, and Saddle is 6 miles ahead.