Steven R. Ritchie
Assistant General Manager, Water
September 5, 2023
Water Supply Conditions Update
September 5, 2023 Reservoir Storage
Storage as of:
Reservoir
Current
Storage1,2,3
Maximum
Storage4
Available
Capacity
Percent of
Maximum
S
torage
Normal
Percent of
M
aximum
Storage5
(AF) (AF) (AF)
Tuolumne System
Hetch Hetchy 358,600 360,360 1,760 99.5% 86.5%
Cherry 254,200 273,345 19,145 93.0% -
Eleanor 26,550 27,100 550 98.0% -
Water Bank 570,000 570,000 0 100.0% 100.0%
Total Tuolumne Storage 1,209,350 1,230,805 21,455 98.3% - Local System
Calaveras 91,241 96,670 5,429 94.4% -
San Antonio 51,685 53,266 1,581 97.0% -
Crystal Springs 49,250 68,953 19,703 71.4% -
San Andreas 15,201 18,675 3,474 81.4% -
Pilarcitos 2,732 3,125 393 87.4% -
Total Local Storage 210,109 240,689 30,580 87.3% -
Total System Storage 1,419,459 1,471,494 52,035 96.5% 83.5% Total without water bank 849,459 901,494 52,035 94.2% - 2 Water bank storage reported by HHWP for 09/04/2023
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 5-Sep-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
September 4, 2023
Avg Annual Total: 36.68 inches
YTD Total: 61.90 inches
Bay Area 7-station Precipitation Index
as of September 4, 2023
Avg Annual Total: 22.80 inches
YTD Total: 44.32 inches
Upcountry Snowpack
Water Available to the City
Tuolumne River Water Available
to the City
National
Precipitation
Forecast
Total Deliveries