Spadra Creek Nature Trail features 8 miles of hiking trails near Clarksville, AR.
I-40 to exit 58, go north on hwy 103. There is a trail head to the left just past the waffle house. If you continue North there is another trailhead (the official one) at the College of the Ozarks. Both trail heads are marked with signs.
http://www.tripleblaze.com/trail.php?c=3&i=2750