Snowball,
The rumors are true. I've caught Crappie while fishing for Bass at The Hagg. They have hit small Rapallas, 2" black worms, and miscellaneous in-line spinners (rooster tails, Mepps Algias). Always seem to locate them in the coves where there is lots of cover.
As to the Bluegill - rumor I hear is that the Oregon Bass & Panfish club hold a Bluegill Fishing Derby for kids every year at Hagg - and they catch hundreds. Might be worth inquiring with them as to your best practice for Bluegill.
As for your offer to haul an extra bass knucklehead around in your boat - shoot me an email! Mayhaps we can hook up!
Best Regards,
Grant C. Lansing
fishnmgn@comcast.net