1 Water Supply Conditions Update
Steven R. Ritchie
Assistant General Manager, Water
March 17, 2025
March 17, 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 276,400 360,360 83,960 76.7% 62.4%
Cherry 244,300 273,345 29,045 89.4% -
Eleanor 23,750 27,100 3,350 87.6% -
Water Bank 570,000 570,000 0 100.0% 99.0%
Total Tuolumne Storage 1,114,450 1,230,805 116,355 90.5% - Local System
Calaveras 75,603 96,670 21,067 78.2% -
San Antonio 44,578 53,266 8,688 83.7% -
Crystal Springs 43,025 68,953 25,928 62.4% -
San Andreas 15,568 18,675 3,107 83.4% -
Pilarcitos 2,091 3,125 1,034 66.9% -
Total Local Storage 180,865 240,689 59,824 75.1% -
Total System Storage 1,295,315 1,471,494 176,179 88.0% 80.0% Total without water bank 725,315 901,494 176,179 80.5% -
Other
California
Reservoirs
3 California Drought Monitor
4 Hetch Hetchy Precipitation
5 Upcountry 6-station Precipitation Index as of
March 16, 2025
12-Month Median Total: 30.92 inches
Current Year Total: 24.47 inches
6 Annual Comparison:
Bay Area 7-station Precipitation Index
as of March 16, 2025
12-Month Median Total: 23.35 inches
Current Year Total: 20.67 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