1 Water Supply Conditions Update
Steven R. Ritchie
Assistant General Manager, Water
September 16, 2024
September 16, 2024 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 300,100 360,360 60,260 83.3% 83.4%
Cherry 243,500 273,345 29,845 89.1% -
Eleanor 20,920 27,100 6,180 77.2% -
Water Bank 570,000 570,000 0 100.0% 99.7%
Total Tuolumne Storage 1,134,520 1,230,805 96,285 92.2% - Local System
Calaveras 88,569 96,670 8,101 91.6% -
San Antonio 49,094 53,266 4,172 92.2% -
Crystal Springs 52,106 68,953 16,847 75.6% -
San Andreas 11,598 18,675 7,077 62.1% -
Pilarcitos 2,322 3,125 803 74.3% -
Total Local Storage 203,689 240,689 37,000 84.6% -
Total System Storage 1,338,209 1,471,494 133,285 90.9% 82.0% Total without water bank 768,209 901,494 133,285 85.2% -
Other
California
Reservoirs
3 California Drought Monitor
4 Hetch Hetchy Precipitation
5 Upcountry 6-station Precipitation Index as of
September 15, 2024
12-Month Median Total: 30.92 inches
Current Year Total: 32.25 inches
6 Annual Comparison:
Bay Area 7-station Precipitation Index
as of September 15, 2024
12-Month Median Total: 23.35 inches
Current Year Total: 29.88 inches
7 Annual Comparison:
Upcountry Snowpack
8 Water Available to the City
9 10
National Precipitation Forecast
Total Deliveries