1 Water Supply Conditions Update
Steven R. Ritchie
Assistant General Manager, Water
October 2, 2023
October 2, 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 340,700 360,360 19,660 94.5% 79.0%
Cherry 247,700 273,345 25,645 90.6% -
Eleanor 22,540 27,100 4,560 83.2% -
Water Bank 570,000 570,000 0 100.0% 99.7%
Total Tuolumne Storage 1,180,940 1,230,805 49,865 95.9% - Local System
Calaveras 89,400 96,670 7,270 92.5% -
San Antonio 50,848 53,266 2,418 95.5% -
Crystal Springs 50,445 68,953 18,508 73.2% -
San Andreas 14,720 18,675 3,955 78.8% -
Pilarcitos 2,701 3,125 424 86.4% -
Total Local Storage 208,114 240,689 32,575 86.5% -
Total System Storage 1,389,054 1,471,494 82,440 94.4% 79.8% Total without water bank 819,054 901,494 82,440 90.9% -
Other
California
Reservoirs
California Drought Monitor
Hetch Hetchy Precipitation
5 Upcountry 6-station Precipitation Index as of
September 30, 2023 (end of Water Year 2023)
Avg Annual Total: 36.68 inches
YTD Total: 62.11 inches
Bay Area 7-station Precipitation Index as of
September 30, 2023 (end of Water Year 2023)
Avg Annual Total: 22.80 inches
YTD Total: 44.49 inches
Upcountry Snowpack
Water Available to the City
Tuolumne River Water Available
to the City
National Precipitation Forecast
Total Deliveries