1 Drought Conditions Update
Steven R. Ritchie
Assistant General Manager, Water
May 16, 2022
May 16, 2022 Reservoir Storage
Reservoir
Current
Storage1,2,3
Maximum
Storage4
Available
Capacity
Percent of
Maximum
Storage
Normal
Percent of
Maximum
Storage5
(AF) (AF) (AF)
Tuolumne System
Hetch Hetchy 341,400 360,360 18,960 94.7% 75.7%
Cherry 261,300 273,345 12,045 95.6% -
Eleanor 26,410 27,100 690 97.5% -
Water Bank 273,390 570,000 296,610 48.0% 90.8%
Total Tuolumne Storage 902,500 1,230,805 328,305 73.3% - Local System
Calaveras 62,586 96,670 34,084 64.7% -
San Antonio 45,892 53,266 7,374 86.2% -
Crystal Springs 49,273 58,309 9,036 84.5% -
San Andreas 12,852 19,027 6,175 67.5% -
Pilarcitos 2,870 3,030 160 94.7% -
Total Local Storage 173,473 230,302 56,829 75.3% -
Total System Storage 1,075,973 1,461,107 385,134 73.6% 84.4% Total without water bank 802,583 891,107 88,524 90.1% -
Other
California
Reservoirs
California Drought Monitor
Hetch Hetchy Precipitation
5 Upcountry Snowpack
Water Available to the City
Tuolumne River Water Available
to the City
Upcountry 6-station Precipitation Index as of
May 15, 2022
Avg Annual Total: 36.68 inches
YTD Total: 23.53 inches
Bay Area 7-station Precipitation Index
as of May 15, 2022
Avg Annual Total: 22.80 inches
YTD Total: 23.31 inches
National Precipitation Forecast
Total Deliveries