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 · 1.12M af of 3.52M af
2 reservoirs · 377,455 af of 918,882 af
19 reservoirs · 2.61M af of 4.02M af
8 reservoirs · 2.49M af of 3.48M af
3 reservoirs · 329,831 af of 399,063 af
28 reservoirs · 3.00M af of 3.58M af
13 reservoirs · 2.14M af of 2.47M af
5 reservoirs · 518,588 af of 592,377 af
24 reservoirs · 5.98M af of 6.78M af
6 reservoirs · 3.43M af of 3.87M af
4 reservoirs · 530,272 af of 549,895 af