Deschutes River in North Centeral Oregon.
Drive is probably not that much different; probably actually easier. The entire bottom end (about 1/3'rd) of the lower river is set up with one after another, after another. You may 'pay' $3 bucks/night for a BLM camping fee, but a big deal?
BLM/Oregon State Parks has a dead on map of the river from Warm Springs to the mouth. You can get a hard copy (I recommend) for about ten bucks or the map is on line for free.
"We sleep soundly in our beds because rough men stand ready in the night to visit violence on those who would do us harm." – Winston Churchill