Is this a fairly new law or is it an old law ? It seems crazy that you can't have a beer while at the lake but you can smoke a few joints if you want to. It's the complete opposite here.
It's more remote, worse weather, and lots of folks up there get WAY carried away boozing. Combine all that and the authorities got tired of people dying on the lake I would imagine.
I've been surprised by ground blizzards up on big windy - I am VERY glad I wasn't hammed when it happened.