1 Water Supply Conditions Update
Steven R. Ritchie
Assistant General Manager, Water
May 5, 2025
May 5, 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 307,900 360,360 52,460 85.4% 70.3%
Cherry 260,700 273,345 12,645 95.4% -
Eleanor 24,670 27,100 2,430 91.0% -
Water Bank 570,000 570,000 0 100.0% 95.8%
Total Tuolumne Storage 1,163,270 1,230,805 67,535 94.5% - Local System
Calaveras 77,107 96,670 19,563 79.8% -
San Antonio 45,285 53,266 7,981 85.0% -
Crystal Springs 45,632 68,953 23,321 66.2% -
San Andreas 15,674 18,675 3,001 83.9% -
Pilarcitos 1,962 3,125 1,163 62.8% -
Total Local Storage 185,660 240,689 55,029 77.1% -
Total System Storage 1,348,930 1,471,494 122,564 91.7% 82.1% Total without water bank 778,930 901,494 122,564 86.4% -
Other
California
Reservoirs
3 California Drought Monitor
4 Hetch Hetchy Precipitation
5 Upcountry 6-station Precipitation Index as of
May 4, 2025
12-Month Median Total: 30.92 inches
Current Year Total: 28.74 inches
6 Annual Comparison:
Bay Area 7-station Precipitation Index
as of May 4, 2025
12-Month Median Total: 23.35 inches
Current Year Total: 22.38 inches
7 Annual Comparison:
Upcountry Snowpack
8 Water Available to the City
9 Tuolumne River Water Available
to the City
10 11
National Precipitation Forecast
Total Deliveries
12