I have had a few moorings installed here in the PNW, where I am I need a county permit, DNR permit. We typically use the helical screw moorings if the bottom allows.. they really hold and the entire assembly is galvanized. I would think the army corps of engineers may have a say on the lakes in Seattle also. Here the only real negative to long term moorings is the birds love to use them as a roost / bathroom.
Good Luck,
HOLLYWOOD
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