The park on the Palouse side of the river is day use only. The Marina is a KOA and can be booked by reservation. They almost always have tent spots open!
If you are going to Lyons Ferry State Park you are required to have a Discover Pass or pay a 5 dollar day use charge. The ticket for not oaying is 90 dollars. The KOA accross the river requires payment for use. Call them for information.
Thanks! Your answer is awaiting moderation.