1 Water Supply Conditions Update
Steven R. Ritchie
Assistant General Manager, Water
October 19, 2026
October 19, 2026 Reservoir Storage
2 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 271,600 360,360 88,760 75.4% 74.9%
Cherry 239,400 273,345 33,945 87.6% -
Eleanor 15,080 27,100 12,020 55.6% -
Water Bank 570,000 570,000 0 100.0% 97.4%
Total Tuolumne Storage 1,096,080 1,230,805 134,725 89.1% - Local System
Calaveras 51,854 96,670 44,816 53.6% -
San Antonio 42,444 53,266 10,822 79.7% -
Crystal Springs 40,990 68,953 27,963 59.4% -
San Andreas 16,236 18,675 2,439 86.9% -
Pilarcitos 1,675 3,125 1,450 53.6% -
Total Local Storage 153,199 240,689 87,490 63.7% -
Total System Storage 1,249,279 1,471,494 222,215 84.9% 79.3% Total without water bank 679,279 901,494 222,215 75.4% - 2 Water bank storage reported by HHWP for 10/18/2026
3 Local storage is the date's 8AM storage value 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 19-Oct-2026
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
3 California Drought Monitor
4 Hetch Hetchy Precipitation
5 Upcountry 6-station Precipitation Index as of
October 18, 2026
12-Month Median Total: 30.92 inches
Current Year Total: 0.01 inches
6 Annual Comparison:
Bay Area 7-station Precipitation Index
as of October 18, 2026
12-Month Median Total: 23.35 inches
Current Year Total: 0.00 inches
7 Annual Comparison:
Upcountry Snowpack
8 Water Available to the City
9 Upcountry
Precipitation
Forecast
10 Bay Area
Precipitation
Forecast
11 Total Deliveries
12