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Park at the state boat launch on Dock St behind the Stewarts on Rt 9 (see google maps). Walk out to Clark Island and get even with the white boat house. I caught a 22" laker there last weekend jigging and marked a few others as well as lots of smelt. Id focus my efforts in 40-70FOW. Lemme know how ya make out.
Your best chance of getting any Lakers is to jig up some smelt and put them on your tip-ups. We got six keepers that way friday.