Core Supply Dashboard
WY 2025-26 Precipitation Forecast: Above Normal, Decreasing to the South
Following an “average” year in 2024-25, it looks like much of California will have a chance of experiencing above average precipitation in water year 2025-26, with a modest drying gradient to the south. Refer to the Insights Section for more details (left sidebar).
The dashboard below shows the Core Supply status (Regions 2, 4, and 6, shaded blue) with observed data through December 31, 2025.
For details by region, see the Regional section below.
Core Supply:
CAP Forecast WY 2025-26
Core Supply: Year-over-Year Comparison
Highlights
- After a slow start, late-December storms delivered nearly 10 inches of precipitation to the Core Supply region, increasing water year progress by 19 percentage points.
- December Core Supply precipitation totaled 9.73 inches — well above the climatological December average of 7 inches — and bringing the observed precipitation to 44.86% of water-year average.
- This two-week surge in precipitation pushed the current water year past the early-season totals of analog years 2018–19 and 2024–25. See the Insights Section for more on this year’s precipitation.
- Observed reservoir inflows through December 31, 2025 are available in the CRAFT section of the portal while the Insights section highlights Lake Shasta and Lake Oroville, comparing inflow forecasts alongside observed values.
Latest Insight
January 2026
Closing Out 2025 with a Bang
After a quiet start, late December featured a series of atmospheric rivers that delivered widespread precipitation across California. These late-month storms delivered meaningful precipitation to much of the state and added significant snowpack.
CAP: Regional Reports
Region 2
Sacramento, Yuba, Feather & American
Region 3
Russian, Napa, & San Francisco Bay
Region 4
San Joaquin & Tulare
Region 6
Kern & Kings
CRAFT | Reservoir Inflow Forecast
Water Year 2025-26 With Observed Data through 12/31/2025
MAF
Trinity Lake
Lake Shasta
Lake Oroville
New Bullards Bar Reservoir
Englebright Reservoir
Folsom Lake
Pardee Reservoir
New Hogan Reservoir
New Melones Reservoir
Hetch Hetchy Reservoir
New Don Pedro Reservoir
Exchequer Reservoir
Millerton Lake
Pine Flat Reservoir
Lake Kaweah
Lake Success
Lake Isabella
MAF
