New boater question for anyone in the OR/WA area. How can you tell when a dock is public / available for an hour or two of mooring? Being in the Portland area I spend much of my boating time on the Willamette river, and is there a way to tell if a dock is available for public mooring and whether or not it's free? For example i see there is the waverly marina, the riverplace marina, and a bunch of others on the willamette. How do i know if we can dock there for two hours if we want to go walk and explore something nearby?