1 Water Supply Conditions Update
Steven R. Ritchie
Assistant General Manager, Water
June 5, 2023
June 5, 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 300,200 360,360 60,160 83.3% 93.6%
Cherry 204,700 273,345 68,645 74.9% -
Eleanor 24,920 27,100 2,180 92.0% -
Water Bank 570,000 570,000 0 100.0% 95.6%
Total Tuolumne Storage 1,099,820 1,230,805 130,985 89.4% - Local System
Calaveras 95,001 96,670 1,669 98.3% -
San Antonio 53,096 53,266 170 99.7% -
Crystal Springs 54,515 68,953 14,438 79.1% -
San Andreas 15,386 18,572 3,186 82.8% -
Pilarcitos 2,638 3,125 487 84.4% -
Total Local Storage 220,636 240,586 19,950 91.7% -
Total System Storage 1,320,456 1,471,391 150,935 89.7% 84.8% Total without water bank 750,456 901,391 150,935 83.3% -
Other
California
Reservoirs
California Drought Monitor
Hetch Hetchy Precipitation
5 Upcountry 6-station Precipitation Index as of
June 4, 2023
Avg Annual Total: 36.68 inches
YTD Total: 60.11 inches
Bay Area 7-station Precipitation Index
as of June 4, 2023
Avg Annual Total: 22.80 inches
YTD Total: 44.21 inches
Upcountry Snowpack
Water Available to the City
Tuolumne River Water Available
to the City
National Precipitation Forecast
Total Deliveries