In looking at an online landowner parcel map, the Parks Bar Road is Caltrans property, included within the Highway 20 property lines. It is NOT privately owned. This person would legally seem to have no right to charge for parking on this road. It is Caltrans property all the way up to the gate into Nordic Industries quarry.

As well, near the gate to the quarry, the section below the road is Nordic Industries property. If you can make it through some bushes, it looks like you can access the river through Nordic Properties land, and avoid the property where the landowner is enforcing trespass rights. I have not been to the bridge for awhile, so I am not sure what access is like through the bushes, or how Nordic Industries feels about that.

Bob