A group that measures river basin health cited the poor condition of infrastructure such as locks and dams, among other things, on what it says is the world's fourth-largest watershed.
As if the drought weren't bad enough, four of the area's aqueducts sit on the San Andreas Fault. Engineers are working to protect the water system against the next major earthquake.
Recent water-related problems in Los Angeles and Ohio have put a focus on infrastructure. Many of the pipes in the U.S. are more than 100 years old and may not be replaced for another 100 years.