HUC-N

Cahokia-Joachim

Spoon

Lower Rock

Mackinaw

Upper Sangamon

Vermilion (Wabash)

Sugar

Flint-Henderson

Peruque-Piasa

South Fork Sangamon

Kishwaukee

Lower Fox

Copperas-Duck

Lower Kaskaskia

Big Muddy

Skillet

Lower Wabash

Des Plaines

Embarras (Lawrenceville)

Shoal

Upper Miss/Cape Girardeau

Cache

Lower Ohio

Upper Illinois

Iroquois

Highland-Pigeon

Salt

Upper Kaskaskia

Upper Fox

Middle Wabash-Lil Verm

Pecatonica

Bear-Wyaconda

Macoupin

Saline

Lower Sangamon

Kankakee

La Moine

Apple-Plum

Lower Illinois-Lake Chautauqua

Middle Kaskaskia

Little Wabash

Lower Ohio-Bay

Green

Lower Illinois-Senachwine Lake

Vermilion (IL)

The Sny

Lower Illinois

Chicago

Middle Wabash-Busseron