I went there in the middle of Summer '93 on a northern road that I believe has since been closed. It took something near 2 hours, IIRC, just driving in on that washboard road. Fun stuff, and great for shaking your fillings loose. ;-D
That has to be the same road. It was not maintained, no gravel, impassable when muddy, and rock outcroppings every where. I had to move all over the road to avoid hitting the oil pan on that caddy.