1 Water Supply Conditions Update
Steven R. Ritchie
Assistant General Manager, Water
March 20, 2023
March 20, 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 272,400 360,360 87,960 75.6% 61.0%
Cherry 194,000 273,345 79,345 71.0% -
Eleanor 23,400 27,100 3,700 86.3% -
Water Bank 570,000 570,000 0 100.0% 99.6%
Total Tuolumne Storage 1,059,800 1,230,805 171,005 86.1% - Local System
Calaveras 96,883 96,670 0 100.0% -
San Antonio 53,266 53,266 0 100.0% -
Crystal Springs 54,630 68,953 14,323 79.2% -
San Andreas 16,183 18,572 2,389 87.1% -
Pilarcitos 2,979 3,125 146 95.3% -
Total Local Storage 223,941 240,586 16,858 93.1% -
Total System Storage 1,283,741 1,471,391 187,863 87.2% 80.2% Total without water bank 713,741 901,391 187,863 79.2% -
Other
California
Reservoirs
California Drought Monitor
Hetch Hetchy Precipitation
5 Upcountry 6-station Precipitation Index as of
March 18, 2023
Avg Annual Total: 36.68 inches
YTD Total: 54.83 inches
Bay Area 7-station Precipitation Index
as of March 18, 2023
Avg Annual Total: 22.80 inches
YTD Total: 38.54 inches
Upcountry Snowpack
Water Available to the City
Tuolumne River Water Available
to the City
National Precipitation Forecast
Total Deliveries
Drought Tracker