Each basin's figure is storage-weighted: total conservation storage divided by total conservation capacity, so large reservoirs count for more than small ones. Sorted driest first.
3 reservoirs · 1.23M af of 3.52M af
2 reservoirs · 346,417 af of 918,882 af
19 reservoirs · 2.57M af of 4.02M af
8 reservoirs · 2.31M af of 3.48M af
3 reservoirs · 305,063 af of 399,063 af
28 reservoirs · 2.96M af of 3.58M af
6 reservoirs · 3.28M af of 3.87M af
24 reservoirs · 5.79M af of 6.78M af
5 reservoirs · 484,016 af of 565,174 af
13 reservoirs · 2.13M af of 2.47M af
4 reservoirs · 517,775 af of 549,895 af