Steven R. Ritchie
Assistant General Manager, Water
January 3, 2023
Drought Conditions Update
Current Reservoir Storage
Storage as of:
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 271,300 360,360 89,060 75.3% 66.6%
Cherry 236,900 273,345 36,445 86.7% -
Eleanor 23,850 27,100 3,250 88.0% -
Water Bank 413,500 570,000 156,500 72.5% 98.7%
Total Tuolumne Storage 945,550 1,230,805 285,255 76.8% - Local System
Calaveras 80,972 96,670 15,698 83.8% -
San Antonio 53,678 53,266 0 100.0% -
Crystal Springs 58,806 58,309 0 100.0% -
San Andreas 17,216 19,027 1,811 90.5% -
Pilarcitos 3,003 3,030 27 99.1% -
Total Local Storage 213,675 230,302 17,536 92.8% -
Total System Storage 1,159,225 1,461,107 302,791 79.3% 79.6% Total without water bank 745,725 891,107 146,291 83.7% - 2 Water bank storage reported by HHWP for 1/2/2023
3 Local storage i s the date's 8AM storage val ue taken from USGS data 5The ratio of median storage for this day over maximum storage capacity. Median storage for this day is based on historical storage data from years 1991 - 2020 3-Jan-2023
1 Upcountry storage is the date's 8AM storage value taken from USGS data 4 Hetch Hetchy maximum storage is with drum gates activated. Cherry and Eleanor maximum storage is with flashboards in. All maximum storages taken from rating curve.
Other
California
Reservoirs
California Drought Monitor
Hetch Hetchy Precipitation
5 Upcountry 6-station Precipitation Index as of
January 2, 2023
Avg Annual Total: 36.68 inches
YTD Total: 21.48 inches
Bay Area 7-station Precipitation Index
as of January 1, 2023
Avg Annual Total: 22.80 inches
YTD Total: 17.20 inches
Upcountry Snowpack
Water Available to the City
National
Precipitation
Forecast
Total Deliveries