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Heat Wave Devours Sierra Snowpack as California Struggles to Capture Runoff

Reservoirs held high for flood protection leave little room to store the sudden runoff.

Overview

  • State hydrology officials say the traditional April 1 peak is unlikely, with some reporting the Sierra snowpack is shrinking by about 1% per day.
  • California’s largest reservoirs sit about 86% full, roughly 120% of average for the date, but much of the remaining space is reserved for potential storms and flood control.
  • Water managers warn the rapid melt will be difficult to store due to limited available capacity, with releases prioritized to maintain dam safety and required flows.
  • Some local systems plan to bank what they can, with East Bay MUD at 83% capacity preparing to capture inflows and Marin’s reservoirs already near 100%.
  • Longer-term fixes remain distant, as projects funded by voter-approved bonds advance slowly and the federally approved Sites Reservoir still faces years of permitting and construction.