1 Water Supply Conditions Update
Steven R. Ritchie
Assistant General Manager, Water
June 30,2025
June 30, 2025, 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 359,200 360,360 1,160 99.7% 98.7%
Cherry 265,900 273,345 7,445 97.3% -
Eleanor 26,710 27,100 390 98.6% -
Water Bank 570,000 570,000 0 100.0% 100.0%
Total Tuolumne Storage 1,221,810 1,230,805 8,995 99.3% - Local System
Calaveras 74,854 96,670 21,816 77.4% -
San Antonio 49,417 53,266 3,849 92.8% -
Crystal Springs 43,486 68,953 25,467 63.1% -
San Andreas 16,153 18,675 2,522 86.5% -
Pilarcitos 1,923 3,125 1,202 61.5% -
Total Local Storage 185,833 240,689 54,856 77.2% -
Total System Storage 1,407,643 1,471,494 63,851 95.7% 90.7% Total without water bank 837,643 901,494 63,851 92.9% -
Other
California
Reservoirs
3 California Drought Monitor
4 Hetch Hetchy Precipitation
5 Upcountry 6-station Precipitation Index
as of June 29, 2025
12-Month Median Total: 30.92 inches
Current Year Total: 28.87 inches
6 Annual Comparison:
Bay Area 7-station Precipitation Index
as of June 29, 2025
12-Month Median Total: 23.35 inches
Current Year Total: 22.63 inches
7 Annual Comparison:
Upcountry Snowpack
8 Water Available to the City
9 Tuolumne River Water Available
to the City
10 California Precipitation Forecast
11 12
Upcountry Precipitation Forecast
Total Deliveries
13