1 Water Supply Conditions Update
Steven R. Ritchie
Assistant General Manager, Water
June 15, 2026
June 15, 2026, Reservoir Storage
2 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 361,200 360,360 0 100.0% 99.2%
Cherry 266,500 273,345 6,845 97.5% -
Eleanor 26,800 27,100 300 98.9% -
Water Bank 570,000 570,000 0 100.0% 100.0%
Total Tuolumne Storage 1,224,500 1,230,805 7,145 99.5% - Local System
Calaveras 57,786 96,670 38,884 59.8% -
San Antonio 44,373 53,266 8,893 83.3% -
Crystal Springs 45,754 68,953 23,199 66.4% -
San Andreas 15,897 18,675 2,778 85.1% -
Pilarcitos 1,953 3,125 1,172 62.5% -
Total Local Storage 165,763 240,689 74,926 68.9% -
Total System Storage 1,390,263 1,471,494 82,071 94.5% 86.4% Total without water bank 820,263 901,494 82,071 91.0% -
Other
California
Reservoirs
3 California Drought Monitor
4 Hetch Hetchy Precipitation
5 Upcountry 6-station Precipitation Index as of
June 14, 2026
12-Month Median Total: 30.92 inches
Current Year Total: 30.43 inches
6 Annual Comparison:
Bay Area 7-station Precipitation Index
as of June 14, 2026
12-Month Median Total: 23.35 inches
Current Year Total: 25.94 inches
7 Annual Comparison:
Upcountry Snowpack
8 Water Available to the City
9 Tuolumne River Water Available
to the City
10 11
California Precipitation Forecast
12 Upcountry Precipitation Forecast
Total Deliveries
13