It isn't common but some of them do fill in. One of the criteria for obtaining a boathouse permit is documenting the site is not subject to sand migration along the shore. This reduces the likelihood that sediment accumulation will be a problem. Whether or not accumulation will occur is a function of many things such as having a source of sand, the angle at which the prevailing wind and waves strike the shoreline, and the angle of the cut back into the shoreline. The reflection of wave action around the interior of the boathouse does not have any self-cleaning effect.
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