Hi,  can't really compare the two because I've only been to Battle Park.  The last 15 miles off the black top to Battle Park is a rough, rocky, not very well maintained road.  Hard, dirt surface, but very rough. Also large rocks and deep holes.  

If you don't want to shake everything apart, I would plan on a 45 min to 1 hour trip for the last 15 miles.  There are horse and people supplies in the town of Ten Sleep but would recommend bringing as much as you can to avoid the 15 mile trip in and out.  Great riding, worth the trip

Would appreciate any information on the Big Sandy "Shoshone" camping area, trails, drive in, etc.

Thanks, Dennis

I know bob is trying to get a comparison of what he knows vs where he has not been. And he and I have talked about this.  The road into Big Sandy is  about 45 miles of gravel. Depending on the last time the grader went down the road it can be prettty smooth or it can be terribly washboard.

Most of the road just runs out through the sagebrush country. The last 8-10 miles follows the river vally up and has hills of bothsides. The road can be a little narrower in the area. It's not a road that tears bumpers off. but it can vibrate the heck out of your trailer if it's washboard and you drive the wrong speed.

Same thing for the road into Green River Lakes. 40-45 miles of gravel road. Folks in suburbans fly by at 40 mph. Pulling horses or big RV's you creep along at 15 mph. Of course the ranchers with their stock trailers fly by at 40 mph. Their tires only hitting about every 4th washboard.