The Main Salmon is never too low. You might be dodging a few more rocks than you normally see, but you definitely won't be dragging your boat. There are lots of nice sand beaches between Vinegar and Riggins. River right should keep you away from the car campers next to the road, but both sides have enormous beaches. We've taken out at Spring Bar before and added an extra night to our trip. The river right beach camp after Carey Creek was one of my favorites of the trip.
"We are all visitors to this time, this place. We are just passing through. Our purpose here is to observe, to learn, to grow, to love....and then we return home."
Australian Aboriginal Proverb