Abstract: A boat dock construction in which most of the support assembly is left throughout the year in the lake. The support assembly includes a plurality of pairs of pivotable legs which can be pivoted into a vertical position where they can accept H-shaped stanchions. A platform or platform is placed over cross members on the stanchions to complete the assembly. In the late fall, the platform and stanchions are removed for storage while the remainder of the support assembly remains below the water line in the lake.