1 Water Supply Conditions Update
Steven R. Ritchie
Assistant General Manager, Water
July 31, 2023
July 31, 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 360,900 360,360 0 100.0% 95.9%
Cherry 267,300 273,345 6,045 97.8% -
Eleanor 26,840 27,100 260 99.0% -
Water Bank 570,000 570,000 0 100.0% 100.0%
Total Tuolumne Storage 1,225,040 1,230,805 6,305 99.5% - Local System
Calaveras 92,747 96,670 3,923 95.9% -
San Antonio 52,275 53,266 991 98.1% -
Crystal Springs 51,874 68,953 17,079 75.2% -
San Andreas 15,563 18,675 3,112 83.3% -
Pilarcitos 2,751 3,125 374 88.0% -
Total Local Storage 215,210 240,689 25,479 89.4% -
Total System Storage 1,440,250 1,471,494 31,784 97.9% 87.7% Total without water bank 870,250 901,494 31,784 96.5% -
Other
California
Reservoirs
California Drought Monitor
Hetch Hetchy Precipitation
5 Upcountry 6-station Precipitation Index as of
July 30, 2023
Avg Annual Total: 36.68 inches
YTD Total: 60.54 inches
Bay Area 7-station Precipitation Index
as of July 30, 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