Used to ride ATV and dirt bikes to the ORV park below the dam in Salina, Never so any jeeps but a pickup or small SUV ever now and then. I took the JK out there a couple weeks ago and got it muddy. i have heard tell that it is 1600 acres. Thought I would let everyone know. Easy to find. about 8 miles east of Pryor on hwy 20. Just before you cross the bridge over Lake Hudson turn right (there is a gas station on the left right across the hwy from where you turn right) not sure the name of the street but if you cross the bridge turn around and come back and take first left. follow this road until it dead ends at the river below the dam. The ORV park is right there.