Pretty much first come first serve, except there are several regulars that park there every week and their spots are saved for them. We park at cement plant for our yearly RV trip and the same folks are generally in their same spots. Otherwise, starting Friday afternoon, just roll in and claim a spot. It's actually a good scene - on the river, watch the boats, UT and visiting fans present, and the guy that manages the lot will smoke ribs on Friday night and make breakfast that you can buy on Sat. a.m.