1 Water Supply Conditions Update
Steven R. Ritchie
Assistant General Manager, Water
May 20, 2024
May 20, 2024 Reservoir Storage
2 g
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 322,800 360,360 37,560 89.6% 77.0%
Cherry 264,900 273,345 8,445 96.9% -
Eleanor 25,790 27,100 1,310 95.2% -
Water Bank 570,000 570,000 0 100.0% 95.1%
Total Tuolumne Storage 1,183,490 1,230,805 47,315 96.2% - Local System
Calaveras 94,811 96,670 1,859 98.1% -
San Antonio 51,129 53,266 2,137 96.0% -
Crystal Springs 50,667 68,953 18,286 73.5% -
San Andreas 12,285 18,675 6,390 65.8% -
Pilarcitos 2,382 3,125 743 76.2% -
Total Local Storage 211,274 240,689 29,415 87.8% -
Total System Storage 1,394,764 1,471,494 76,730 94.8% 83.4% Total without water bank 824,764 901,494 76,730 91.5% -
y
Other
California
Reservoirs
3 California Drought Monitor
4 Hetch Hetchy Precipitation
5 Upcountry 6-station Precipitation Index as of
May 19, 2024
12-Month Median Total: 30.92 inches
Current Year Total: 31.78 inches
6 Annual Comparison:
Bay Area 7-station Precipitation Index
as of May 19, 2024
12-Month Median Total: 23.35 inches
Current Year Total: 29.84 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