1 Water Supply Conditions Update
Steven R. Ritchie
Assistant General Manager, Water
April 6, 2026
April 6, 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 336,700 360,360 23,660 93.4% 61.3%
Cherry 260,400 273,345 12,945 95.3% -
Eleanor 25,400 27,100 1,700 93.7% -
Water Bank 570,000 570,000 0 100.0% 99.5%
Total Tuolumne Storage 1,192,500 1,230,805 38,305 96.9% - Local System
Calaveras 62,557 96,670 34,113 64.7% -
San Antonio 44,536 53,266 8,730 83.6% -
Crystal Springs 47,145 68,953 21,808 68.4% -
San Andreas 15,508 18,675 3,167 83.0% -
Pilarcitos 1,939 3,125 1,186 62.0% -
Total Local Storage 171,685 240,689 69,004 71.3% -
Total System Storage 1,364,185 1,471,494 107,309 92.7% 80.3% Total without water bank 794,185 901,494 107,309 88.1% -
Other
California
Reservoirs
3 California Drought Monitor
4 Hetch Hetchy Precipitation
5 Upcountry 6-station Precipitation Index as of
April 5, 2026
12-Month Median Total: 30.92 inches
Current Year Total: 24.34 inches
6 Annual Comparison:
Bay Area 7-station Precipitation Index
as of April 5, 2026
12-Month Median Total: 23.35 inches
Current Year Total: 21.49 inches
7 Annual Comparison:
Upcountry Snowpack
8 Water Available to the City
9 10
California Precipitation Forecast
11 Upcountry Precipitation Forecast
Total Deliveries
12