Diablo Grotto
The Diablo Grotto is composed primarily of cavers from the East Bay and Contra Costa areas of Northern California. Their name is taken from Mount Diablo, a prominent peak in the area. Diablo Grotto trips are regularly scheduled for the Mother Lode and Sierra Nevada caving areas of California. They hold regular meetings on the second Thursday of each month at various rotating locations, but usually in Oakland, CA. Check out their facebook group.
Redwood City Grotto
Mother Lode Grotto
Founded in February of 1962, the MLG is composed primarily of cavers from around Sacramento and the nearby foothill areas of Northern California. MLG trips are regularly scheduled into the Mother lode foothills and other Sierra Nevada caving areas in California.
Western Cave Conservancy
The Western Cave Conservancy is dedicated to securing permanent protection for threatened caves in the western United States. The WCC manages Rippled and Windeler Caves.
Western Region
An association of NSS grottos in California, Nevada, and Southern Oregon which promotes cave conservation, the scientific study of caves, exploration, and speleoeducation. SFBC is part of the Western Region and by joining SFBC you automatically get Western Region membership as well.
Cave Research Foundation
The Cave Research Foundation (CRF)coordinates research efforts and expeditions. California based CRF projects work with the Sequoia and Kings Canyon Cave Management and Lava Beds Research Center. The CRF West trip calendar is available here.