changes over time
If Mother Nature wants the boulder in the lake, it may be better to back fill with other boulders rather than trying to re-set it.
We may be more exposed than some, so we see boulders being moved onto the shoreline due to ice action, as well as some erosion from wave action, especially where boulders were removed to build a breakwater.
Dirt being barged to islands may also be the top layer of raised (Indian Mound) leach fields, far back from shore. Yes, islands that used to be mostly overgrown woods, are now being gradually expanded "grassy areas".
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