Colorado (Lower) basin

Name: Colorado (Lower) basin
Creator: The Waterline
Keywords: Colorado (Lower) basin, reservoir storage, river basin, Arizona / California / Nevada

Reservoir storage across Arizona / California / Nevada

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

Cite

Colorado (Lower) basin storage is 15% below its 5-yr median. The Waterline, data through Aug 12, 2026. https://the-waterline.com/basin/colorado-lower

acre-feet

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<a href="https://the-waterline.com/basin/colorado-lower?utm_source=embed&utm_medium=chart">
  <img src="https://the-waterline.com/charts/basin/colorado-lower/chart.png" alt="Colorado (Lower) 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/colorado-lower?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 · Colorado (Lower) 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: Colorado (Lower) basin
Unit: acre-feet
Calculation: Daily reading
Last observation: Aug 12, 2026
Update frequency: Daily

Now 9.25M af, 15% below the 5-yr median.

Lower Colorado basin storage at 9.28M af, down 9.7% from last year and 14% below the 5-year median. Storage has declined 2.3% this month.

The numbers
Period	Current	Prior	Change
Week over week	9.25M af	9.31M af	-0.6%
Month over month	9.25M af	9.45M af	-2.1%
Year over year	9.25M af	10.28M af	-10.0%
vs 5-yr median	9.25M af	10.86M af	-14.8%

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