My opinion is the crawfish are still in the lake but moved to deeper water due to the invasive Rock Bass taking over their habitat and / or eating them. I also think spraying for milfoil has not helped the reproductive process...Just my opinion however.
As far as the lake being cleaner today than the in the 60's and 70's....There is no doubt the lake is MUCH cleaner today than back then! I can still remember all the hillside vacation camps with their over burdened septic systems leaching directly into the lake on almost the entire southern hillside shoreline from Gilford to Alton. It's a good thing they didn't do bacteria testing and beach advisories / closings back then as you never would of been able to swim in the lake!
Dan
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It's Always Sunny On Welch Island!! 
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