With the first phase of repairs to the Oroville Dam spillway completed, residents downstream can breathe a little easier. Hundreds of engineers and laborers worked around the clock to fortify the nation’s tallest dam before winter rains, and the Department of Water Resources should be congratulated for expediting this enormous task. But there is a key part of this repair that is still to be done to ensure that California’s water system is ready to withstand the challenges of extreme weather events predicted for the future.