| Shoal Creek Near Breese, IL |
| Shoal Creek Near Pierron, IL |
| Silver Creek Near Freeburg, IL |
| Silver Creek Near Troy, IL |
| Sinsinawa River Near Menominee, IL |
| Skillet Fork At Wayne City, IL |
| Skokie River At Lake Forest, IL |
| Skokie River Near Highland Park, IL |
| South Branch Kishwaukee River At Dekalb, IL |
| South Branch Kishwaukee River Near Fairdale, IL |
| South Fork Saline River Near Carrier Mills, IL |
| South Fork Sangamon River Below Rochester, IL |
| South Fork Sangamon River Near Rochester, IL |
| Spoon River At London Mills, IL |
| Spoon River At Seville, IL |
| Spoon River Near St. Joseph, IL |
| Spring Brook At 87Th Street Near Naperville, IL |
| Spring Creek At Springfield, IL |
| St. Joseph Creek At Route 34 At Lisle, IL |
| Sugar Creek At Milford, IL |
| Sugar Creek Near Bloomington, IL |
| Sugar Creek Near Springfield, IL |
| Thorn Creek At Glenwood, IL |
| Thorn Creek At Thornton, IL |
| Tinley Creek Near Palos Park, IL |
| Tyler Creek At Elgin, IL |
| Vermilion River At Pontiac, IL |
| Vermilion River Near Danville, IL |
| Vermilion River Near Leonore, IL |
| Wabash River At Mt. Carmel, IL |
| Waubonsee Creek Near Oswego, IL |
| Weller Creek At Des Plaines, IL |
| West Branch Du Page River Near Naperville, IL |
| West Branch Du Page River Near Warrenville, IL |
| West Branch Du Page River Near West Chicago, IL |
| West Fork Of North Branch Chicago River At Northbrook Il |
| West Okaw River Near Lovington, IL |
| Whitley Creek Near Allenville, IL |
