California’s Chinook salmon came back this fall, due in part to good ocean conditions and abundant water, but the Delta, the largest estuary on the West Coast, is still in critical condition. “Thirty-three species are endangered, and likely to go extinct within the next 25 to 50 years, if not sooner,” said Dr. Peter Moyle, associate director of UC Davis Center for Watershed Sciences. “Many of these are salmon and trout species, and most of the species are found only in California, so they are part of our heritage. If they disappear, they are lost, not only to California, but to the world, forever.”California’s Bay-Delta covers 1300 square miles, is home to 750 species of plants and animals, and is where the Sacramento and San Joaquin rivers meet and flow into the San Francisco Bay. But its ecosystem is collapsing.