first, you always want to get the latest info and updates from the ODFW website, especially for salmon, steelhead, halibut, and sturgeon. you can sign up to get e-mail alerts whenever there is any change or update to the regs. in whatever zones you are interested in.
https://myodfw.com/http://www.eregulations.com/oregon/fishing/
the printed regs. contain lots of good information on what is lawful and unlawful plus the 'permanent' zone and local regs.
also remember that Oregon regs. work in layers- general/state wide comes first, then zone regs that can modify the state regs for that zone, and finally the local exceptions can change/modify the state and zone regs. another way to look at it- if the next layer of regs is silent (makes no changes), then the previous layer of regs. applies. and last are 'in-season updates', often the most important.
I found Dibblee Point, you check for "in-season updates" here:
https://myodfw.com/recreation-report/fishing-report/columbia-zone#Falllooks to be between Puget and Batchelor islands, so this is what applies:
it isn't as difficult as it seems especially if you focus on your specific area and get a good understanding for it's permanent regs and when the in-season updates are released. cheers, roger