1 Water Supply Conditions Update
Steven R. Ritchie
Assistant General Manager, Water
August 14, 2023
August 14, 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 360,700 360,360 0 100.0% 92.6%
Cherry 263,800 273,345 9,545 96.5% -
Eleanor 25,840 27,100 1,260 95.4% -
Water Bank 570,000 570,000 0 100.0% 100.0%
Total Tuolumne Storage 1,220,340 1,230,805 10,805 99.1% - Local System
Calaveras 92,157 96,670 4,513 95.3% -
San Antonio 52,032 53,266 1,234 97.7% -
Crystal Springs 50,708 68,953 18,245 73.5% -
San Andreas 15,553 18,675 3,122 83.3% -
Pilarcitos 2,744 3,125 381 87.8% -
Total Local Storage 213,194 240,689 27,495 88.6% -
Total System Storage 1,433,534 1,471,494 38,300 97.4% 86.5% Total without water bank 863,534 901,494 38,300 95.8% -
Other
California
Reservoirs
California Drought Monitor
Hetch Hetchy Precipitation
5 Upcountry 6-station Precipitation Index as of
August 13, 2023
Avg Annual Total: 36.68 inches
YTD Total: 60.62 inches
Bay Area 7-station Precipitation Index
as of August 13, 2023
Avg Annual Total: 22.80 inches
YTD Total: 44.26 inches
Upcountry Snowpack
Water Available to the City
Tuolumne River Water Available
to the City
National Precipitation Forecast
Total Deliveries