That's a small artificial island, close to shore, with typically a securable "causeway." Larger ones might be for several families, but most were smaller. Wood and stones and packed earth could make a fairly solid place to live.
Life on a small island could be convenient if you and your neighbors traveled by boat a lot. Drinking water is right there. Food you can grow on land and store, or fish for. Wood--presumably the forests were more extensive then.
Storms would be a lot more troublesome than on land, though.
And sewage--oops. Unless there's a good current to move stuff away from your home, you have a problem. Wind-driven currents might help save your health, provided you remembered to dump waste downstream.
I wonder what the currents are like around the craggnogs? I'd guess the builders were smart enough to take note of that detail, but I'd also guess that if current patterns changed they'd not abandon all that effort until it got a reputation as an unlucky home. Or until the extra security of life on the lake didn't matter so much.
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