Internet Explorer 11 is not supported

For optimal browsing, we recommend Chrome, Firefox or Safari browsers.


The number of high-hazard dams within the National Inventory of Dams where the conditions are unknown, including the status of the Hoover Dam and the Oroville Dam, two of the country's largest. Experts have become concerned about the lack of transparency surrounding the dams, because if they were to fail, they could cause life-threatening flooding.

(Associated Press — May 5, 2022)
Special Projects