Footage shows low water mark at biggest US reservoir as shortage declared – video

Officials have declared a dire water shortage at Lake Mead, the US's largest reservoir, triggering significant water cuts in Arizona and other western states.

The US Bureau of Reclamation's first ever declaration of a 'tier 1' shortage represents an acknowledgment that after a 20-year drought, the reservoir that impounds the Colorado River at Hoover Dam has receded to its lowest levels since it was created in the 1930s

• Biggest US reservoir declares historic shortage, forcing water cuts across west