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.
2 reservoirs · 139,002 af of 918,882 af
3 reservoirs · 1.17M af of 3.52M af
19 reservoirs · 2.75M af of 4.02M af
8 reservoirs · 2.68M af of 3.48M af
28 reservoirs · 3.20M af of 3.58M af
3 reservoirs · 364,554 af of 399,063 af
13 reservoirs · 2.27M af of 2.47M af
6 reservoirs · 3.66M af of 3.87M af
5 reservoirs · 561,307 af of 592,377 af
24 reservoirs · 6.50M af of 6.78M af
4 reservoirs · 547,219 af of 549,895 af