There is a public park right off road few miles short of dam. Always just pulled over off road and slept inside fence of the park. Think its called Hells Canyon park. No reservation required. Will be RV and ski boaters taking up the lower developed camp spots enjoying the reservoir. Has a bathroom and shower.
I've done both Scotty's and Hells Canyon Park. If you get there during daylight I would recommend Hells Canyon Park. It is pretty nice hanging in the grass by the river. Scotty's is good for a down and dirty crash for the night.
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