The Colorado River millennial mega-drought continues, despite robust snowpack last winter. Above-average temperatures in spring resulted in a paltry 57% runoff, nowhere near enough water to refill the reservoirs that remain half-empty. Based on these conditions, the U.S. Bureau of Reclamation recently determined that 2021 will be a “tier zero” year under the Lower Colorado River Basin Drought Contingency Plan, with reduced water deliveries for Arizona, Nevada, and Mexico.