I am having a hard time classifying Pinole Valley Watershed. It is land owned by The East Bay Municipal Utility District; they maintain the reservoirs to provide drinking water to the neighboring communities, but they also have some regions available for hiking and other recreational activities. It does not seem appropriate to classify it as a park since the main function of the area is to provide drinking water, and while "nature reserve", the classification I ended up settling on, is more accurate, it also does not seem satisfactory.