The park is on the mainland, or eastern end, of the sandbar between South Hero Island and the town of Milton. The sandbar itself is the result of the Lamoille River washing sediment downstream from the present Lamoille Valley. The river-borne material sank to the bottom as the river emptied into the lake, eventually filling the lake to create the marshland south and east of the park, and the sandbar to the west. Natural lake depths here, without the sandbar, would be over 150 feet.
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