1 San Francisco Public Utilities Commission
Water Supply Conditions Update
Steven R. Ritchie
Assistant General Manager, Water
March 16, 2026
March 16, 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 310,400 360,360 49,960 86.1% 62.9%
Cherry 242,900 273,345 30,445 88.9% -
Eleanor 20,040 27,100 7,060 73.9% -
Water Bank 570,000 570,000 0 100.0% 99.0%
Total Tuolumne Storage 1,143,340 1,230,805 87,465 92.9% - Local System
Calaveras 64,834 96,670 31,836 67.1% -
San Antonio 44,505 53,266 8,761 83.6% -
Crystal Springs 48,966 68,953 19,987 71.0% -
San Andreas 15,374 18,675 3,301 82.3% -
Pilarcitos 1,868 3,125 1,257 59.8% -
Total Local Storage 175,547 240,689 65,142 72.9% -
Total System Storage 1,318,887 1,471,494 152,607 89.6% 79.9% Total without water bank 748,887 901,494 152,607 83.1% -
Other
California
Reservoirs
3 California Drought Monitor
4 Hetch Hetchy Precipitation
5 Upcountry 6-station Precipitation Index as of
March 15, 2026
12-Month Median Total: 30.92 inches
Current Year Total: 23.59 inches
6 Annual Comparison:
Bay Area 7-station Precipitation Index
as of March 15, 2026
12-Month Median Total: 23.35 inches
Current Year Total: 20.92 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
Total Deliveries
12