Cossatot River Ouachitas Region Calculate Trip Get Directions Overview:This scenic river begins in the Ouachita Mountains southeast of Mena and flows south for about 26 miles to Gillham Lake. Thrilling white water for experienced canoeists only; hiking trails, primitive camping Address: Cossatot River Wickes, AR 71973 Phone: 870-385-2201 Connect: Save to foursquare Miscellaneous On or Near: Cossatot River