Corning Subbasin GSA

Sacramento Valley - Corning

What changed at each monthly refresh. Bold lines are notable changes. Subscribe to the RSS feed to get each update in a feed reader.

Readings through Sep 2026: first edition

• Kriged average 76 ft below ground in Sep 2026, 0.9 ft deeper than a year earlier. 68 readings in Jul–Sep 2026.
• 3 of 15 RMS wells read in the last 12 months are below their MT.
• Plan's undesirable-result rule met in the latest readings.
• NOAA-outlook forecast for Sep 2027: 72 ft below ground.
• Under the outlook the plan rule is no longer met at any forecast reading through Sep 2027 (chance about 70%).

Forecasts use the NOAA outlook (CPC's Oct 2026 issue: water year 2027 at 122% of normal precipitation).