April 30, 2026
Region 2: Sacramento, Yuba, Feather & American
Reservoirs
The Region 2 reservoir update focuses on Lake Shasta and Lake Oroville. A snapshot of current storage conditions from the Department of Water Resources is included for each reservoir. Adjacent to that, storage levels for the current water year (dark blue) are shown alongside analog years (2018–19 and 2024–25) for context.
Precipitation
As with the Core Supply, regional precipitation is presented using both the corrected NWS data feed and GG Weather values, offering a comprehensive perspective on how precipitation has been distributed across the region. The NWS stations reflect higher-elevation, basin-oriented conditions most relevant to water supply, while GG Weather values represent valley- and coastal-based observations and in situ recharge.
Differences between the two reflect where precipitation has been most concentrated this season. In a year characterized by predominantly warm storms and coastal-focused storm tracks, lower-elevation locations have generally received a greater share of precipitation.
ALICE model output indicates that Region 2 will receive 105-125% of normal precipitation. Region 2 observed totals are broadly consistent between datasets, with 90.9% (NWS) and 92.5% (GG Weather) of average. The close agreement suggests precipitation has been relatively well distributed across both valley and higher-elevation locations in Northern California.
NWS data indicates that Region 2 saw nearly 7 inches of accumulation during the month of April, adding 16 percentage points to the accumulation.
