California Boat Launching Ramp Map To findĀ California boat launching ramps select the California County of Interest. Alameda Alpine Amador Butte Calaveras Colusa ContraCosta DelNorte El Dorado Fresno Glenn Humboldt Imperial Inyo Kern Kings Lake Lassen LosAngeles Madera Marin Mariposa Mendocino Merced Modoc Mono Monterey Napa Nevada Orange Placer Plumas Riverside Sacramento SanBenito San Bernardino SanDiego SanFrancisco SanJoaquin San LuisObispo SanMateo Santa Barbara SantaClara Santa Cruz Shasta Sierra Siskiyou Solano Sonoma Stanislaus Sutter Tehama Trinity Tulare Tuolumne Ventura Yolo Yuba