1 Water Supply Conditions Update
Steven R. Ritchie
Assistant General Manager, Water
April 17, 2023
April 17, 2023 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 223,400 360,360 136,960 62.0% 60.5%
Cherry 178,600 273,345 94,745 65.3% -
Eleanor 16,000 27,100 11,100 59.0% -
Water Bank 570,000 570,000 0 100.0% 98.7%
Total Tuolumne Storage 988,000 1,230,805 242,805 80.3% - Local System
Calaveras 96,144 96,670 526 100.0% -
San Antonio 53,160 53,266 106 100.0% -
Crystal Springs 53,770 68,953 15,183 78.0% -
San Andreas 16,670 18,572 1,902 89.8% -
Pilarcitos 2,589 3,125 536 82.8% -
Total Local Storage 222,333 240,586 18,253 92.4% -
Total System Storage 1,210,333 1,471,391 261,058 82.3% 79.8% Total without water bank 640,333 901,391 261,058 71.0% -
Other
California
Reservoirs
California Drought Monitor
Hetch Hetchy Precipitation
5 Upcountry 6-station Precipitation Index as of
April 16, 2023
Avg Annual Total: 36.68 inches
YTD Total: 58.76 inches
Bay Area 7-station Precipitation Index
as of April 16, 2023
Avg Annual Total: 22.80 inches
YTD Total: 42.78 inches
Upcountry Snowpack
Water Available to the City
Tuolumne River Water Available
to the City
National Precipitation Forecast
National Precipitation Forecast
Total Deliveries