Montana FAS campground
This was down a gravel road situated by the I94 bridge over the Bighorn River. We took what looked to be the main site with picnic table and fire ring. There may have been more sites especially under the bridge. There was a small but clean vault toilet but no garbage. Thankfully, the traffic on I-94 is light so the noise was negligible. We had a view of the river nestled against the ubiquitous cottonwoods. The site is free. We were there in late September 2020 in a pop up truck camper.