Beaverfan is correct.
Look on Pg. 7 in the 2010 regs, under "Definitions" for the word Bait (middle of the page).
Under ODFW definition, it is ILLEGAL to use bait in/on certain waters where it states, "artificial flies and lures only". And, they consider "bait" to INLCUDE "imitation baits".
Personally I agree with you, it is a dumb ass rule. But, then I have yet to meet anyone intelligent at ODFW.