1 Water Supply Conditions Update
Steven R. Ritchie
Assistant General Manager, Water
May 1, 2023
May 1, 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 241,200 360,360 119,160 66.9% 68.2%
Cherry 176,100 273,345 97,245 64.4% -
Eleanor 24,910 27,100 2,190 91.9% -
Water Bank 570,000 570,000 0 100.0% 96.0%
Total Tuolumne Storage 1,012,210 1,230,805 218,595 82.2% - Local System
Calaveras 94,481 96,670 2,189 97.7% -
San Antonio 53,249 53,266 17 100.0% -
Crystal Springs 53,829 68,953 15,124 78.1% -
San Andreas 16,682 18,572 1,890 89.8% -
Pilarcitos 2,589 3,125 536 82.8% -
Total Local Storage 220,830 240,586 19,756 91.8% -
Total System Storage 1,233,040 1,471,391 238,351 83.8% 81.3% Total without water bank 663,040 901,391 238,351 73.6% -
Other
California
Reservoirs
California Drought Monitor
Hetch Hetchy Precipitation
5 Upcountry 6-station Precipitation Index as of
April 29, 2023
Avg Annual Total: 36.68 inches
YTD Total: 58.84 inches
Bay Area 7-station Precipitation Index
as of April 29, 2023
Avg Annual Total: 22.80 inches
YTD Total: 42.86 inches
Upcountry Snowpack
Water Available to the City
Tuolumne River Water Available
to the City
National Precipitation Forecast
Total Deliveries