Welcome to CDEC A division of DWR

Reservoir Conditions

Snow Surveys collects the end-of-month storage in all of the state's major reservoirs, and produces a report comparing them with historical averages. The California Data Exchange Center (CDEC) makes these reports available to the public, and maintains the database that stores these values.
Daily values are also collected from some principal impoundments, for the purpose of computing unimpaired runoff (full natural flow).
  • Statewide end of month reservoir storage: Current | Previous
  • All reservoir reports available from CDEC

  • California Cooperative Snow Surveys