Just as we left that spot, there was a guy driving an old beater pickup out of a brushy area. Don't know what that was about. Maybe he was watching us?
We did not ride the whole river road. The western section is where the sand and gravel is. But every time I have ridden it, it was not bad. We were running out of daylight and it was raining so we went up Black Gap road back to pavement. Black Gap is the roughest road in the park, but is not bad either. A good rider could take a 990 or big GS just about anywhere in the national park.