San Joaquin basin

Reservoir storage across California

Data through Aug 12, 2026 · source last checked Aug 13, 2026 · page revised Aug 13, 2026

Cite

San Joaquin basin storage is 6% below its 5-yr median. The Waterline, data through Aug 12, 2026. https://the-waterline.com/basin/san-joaquin

acre-feet

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<a href="https://the-waterline.com/basin/san-joaquin?utm_source=embed&utm_medium=chart">
  <img src="https://the-waterline.com/charts/basin/san-joaquin/chart.png" alt="San Joaquin basin storage — Aug 12, 2026" width="720" style="max-width:100%;height:auto;border:0"/>
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<p style="font-size:12px;margin:4px 0 0">Source: <a href="https://the-waterline.com/basin/san-joaquin?utm_source=embed&utm_medium=credit">The Waterline</a> · updates automatically</p>
<p style="font-size:11px;color:#6b6b6b;margin:2px 0 0">About this data: US Bureau of Reclamation RISE; California reservoirs via CA DWR CDEC · Reservoir storage summed across the basin · San Joaquin basin · acre-feet · Daily reading · through Aug 12, 2026</p>

Free to republish with attribution. The chart updates automatically as new data lands.

About this data

Source: US Bureau of Reclamation RISE; California reservoirs via CA DWR CDEC
Series: Reservoir storage summed across the basin
Geography: San Joaquin basin
Unit: acre-feet
Calculation: Daily reading
Last observation: Aug 12, 2026
Update frequency: Daily

Now 1.86M af, 6% below the 5-yr median.

San Joaquin basin storage fell to 1.87M af, down 1.3% on the week. The basin is 6% below its 5-year median. Month-over-month storage declined 8.4%, tracking the ongoing summer drawdown.

The numbers
Period	Current	Prior	Change
Week over week	1.86M af	1.88M af	-1.2%
Month over month	1.86M af	2.02M af	-8.0%
Year over year	1.86M af	1.97M af	-5.7%
vs 5-yr median	1.86M af	1.97M af	-5.7%

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