For thirty years Northern California hosted several informal galleries in which local people constructed unsigned sculpture from flotsam. The work received considerable media publicity. The premier gallery was in Emeryville, but several other locations around the Bay were used, along with subsidiary galleries in Arcata and North Bend, OR. All these tidal galleries have become state parks, nature reserves, or otherwise closed to sculpture-building. Given the creative energy of people in the area, future galleries in other tidal locations are likely to arise.