It’s out: the latest state plan for moving Sacramento River water south to California’s biggest cities and farms. Also just out and almost as long in the making: my history of such ideas and efforts, which now go back a century. I hope my work for the California Water Library will help readers of all viewpoints understand the background of this pivotal, never-ending water controversy. (Do you think the north-to-south transfer is some brand-new “water grab”? Do you think the Bay Area is not among the users of Sacramento water? Think again.) This round of planning is the first to take place against the background of undeniable climate change. Whether the planners have really confronted the new realities is open to question.