Shrimp season opens the third Saturday in May on the Hood Canal. Special pots are required. The mesh size varies depending on if your fishing the Canal or Puget Sound. You can get more info here.
www.wa.gov/wdfw/fish/regs/fishregs/htm
Left side of page under maps and regs for shrimp and other deepwater species.
There is no resource in Oregon that I know of.
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FISH!........GET IN THE BOAT!!!!!