The grizzly was mostly vegetarian, eating grasses, roots, fruits, small animals, and carrion. Although the California genepool is gone, it disappeared so recently, and was so recently connected to the other populations, that they are probably genetically close. So far, the suggested sites are the King Range, Headwaters Forest, and the Santa Lucia Range between Big Sur and Morro Bay. Perhaps they could be connected via corridors to the Sierra foothills, and to Washington and Idaho via Oregon. Of course, the preserves should be designed to protect other endangered species as well, such as the marbled murrelet.
Roads are a major problem for grizzlies.
They avoid roads, and of course roads bring people into contact with the bears. All roads should be removed from their habitat. Where it is necessary for a road or rail line to cross their habitat or travel corridor, ideally, they should tunnel under it. Wildlife underpasses are less effective for some species, if they don't feel safe in them, or if predators learn to set ambush there. Some proposals recommend using the grizzlies to generate tourist dollars.