Copyright © 2014, All Rights Reserved. Mid-Cal Construction specializes in building superior floating boat docks, decks, aluminum gangways, piers, seawalls and marinas. Serving the communities of Northern California, San Francisco Bay Area, Marin County, Sausalito, Larkspur, Tiburon, Belvedere, Mill Valley, Novato, Vallejo, Napa, Redwood Shores, Isleton, Discovery Bay, Sacramento, Bethel Island, California Delta, Sacramento–San Joaquin River Delta, Bass Lake, Lake Tulloch, Point Richmond.