Status of Arizona surface water supplies: May 2021

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The following table summarizes the status of Arizona’s key surface water supplies for the month of May.

2021 2020 2019 2018 2017
COLORADO RIVER SYSTEM
Lake Powell (% full) 35 49 40 52 51
Lake Mead (% full) 38 43 41 39 40
Total Colorado System (% full) 43 52 47 51 51
Elevation (Lake Mead; ft msl) 1,077 1,095 1,088 1,083 1,084
DCP “Tier Zero” Declaration Elevation (ft msl) 1,090 1,090 NA NA NA
Tier 1 Shortage Declaration Elevation (ft msl) 1,075 1,075 1,075 1,075 1,075
Elevation (Lake Powell; ft msl) 3,561 3,601 3,577 3,609 3,605
Upper Basin Water Year Precipitation to Date (% of average) 73 84 119 73 117
Upper Basin Current Snowpack (% of average) 53 68 160 47 110
SALT / VERDE RIVER SYSTEM
Salt River Reservoirs (% full) 79 98 81 61 75
Verde River Reservoirs (% full) 32 98 81 31 76
Total Salt / Verde System (% full) 73 98 81 57 75
Salt/Verde Water Year Precipitation to Date (% of average) 51 104 126 33 116
Salt/Verde Current Snowpack Level (% of average) N/A N/A N/A N/A N/A
CAP STORAGE
Lake Pleasant (% full) 93 95 91 87* 85

*May 2018 Lake Pleasant storage estimated based on lake elevation of 1,691 ft msl

Data compiled from Central Arizona Water Conservation District, U.S. Bureau of Reclamation, and Salt River Project