Camped primitive at Twin Bridges State Park in 2002 by myself. Set up one-person tent. Built a campfire and enjoyed the solitude. Grand lake and Spring river joins together there just over the hill. Thats reason its called Twin Bridges! On 60 highway west of Senaca, Mo and between there and Fairland, Ok going west. Nice shelters with bath houses and picnic tables. Fishing is great! Have roped off swimming area too. Rangers came through every couple hours to do a security check which was nice. Made coffee next morning on fire and brother came with cinnamon rolls and to visit!! What a nice campground.