1 Water Supply Conditions Update
Steven R. Ritchie
Assistant General Manager, Water
May 15, 2023
May 15, 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 249,300 360,360 111,060 69.2% 75.0%
Cherry 181,800 273,345 91,545 66.5% -
Eleanor 24,360 27,100 2,740 89.9% -
Water Bank 570,000 570,000 0 100.0% 91.3%
Total Tuolumne Storage 1,025,460 1,230,805 205,345 83.3% - Local System
Calaveras 95,058 96,670 1,612 98.3% -
San Antonio 53,240 53,266 26 100.0% -
Crystal Springs 54,346 68,953 14,607 78.8% -
San Andreas 16,302 18,572 2,270 87.8% -
Pilarcitos 2,601 3,125 524 83.2% -
Total Local Storage 221,547 240,586 19,039 92.1% -
Total System Storage 1,247,007 1,471,391 224,384 84.8% 84.0% Total without water bank 677,007 901,391 224,384 75.1% -
Other
California
Reservoirs
California Drought Monitor
Hetch Hetchy Precipitation
5 Upcountry 6-station Precipitation Index as of
May 14, 2023
Avg Annual Total: 36.68 inches
YTD Total: 60.01 inches
Bay Area 7-station Precipitation Index
as of May 14, 2023
Avg Annual Total: 22.80 inches
YTD Total: 44.20 inches
Upcountry Snowpack
Water Available to the City
Tuolumne River Water Available
to the City
National Precipitation Forecast
Total Deliveries