| Turkey Chute | Henderson, IL | 20.2 miles | NW |
| Shokokon Slough | Henderson, IL | 21.1 miles | NW |
| Bass Run | Henderson, IL | 21.5 miles | NW |
| Marsden Slough | Henderson, IL | 21.5 miles | NW |
| Craigel Slough | Henderson, IL | 22.1 miles | NW |
| Sullivan Slough | Henderson, IL | 22.1 miles | NW |
| Old Channel Henderson Creek | Henderson, IL | 24.9 miles | NW |
| Green Bayou | Lee, IA | 24.9 miles | NW |
| Phelps Slough | Henderson, IL | 25.4 miles | NW |
| Prairie Slough | Henderson, IL | 25.5 miles | NW |
| Mill Slough | Henderson, IL | 28.1 miles | NW |
| Benton Slough | Henderson, IL | 28.9 miles | NW |
| Campbell Slough | Henderson, IL | 31.7 miles | NW |
| Mapes Chute | Mercer, IL | 36.1 miles | NW |
| Panther Slough | Cass, IL | 37.8 miles | SE |
| Bach Slough | Cass, IL | 37.9 miles | SE |
| Hickory Slough | Mason, IL | 37.9 miles | SE |
| Hog Slough | Cass, IL | 38.3 miles | SE |
| Eagle Slough | Cass, IL | 38.8 miles | SE |
| Ash Swale | Cass, IL | 39.1 miles | SE |
| Dead Slough | Louisa, IA | 39.2 miles | NW |
| Cross Slough | Mason, IL | 39.3 miles | SE |
| Duck Slough | Cass, IL | 39.5 miles | SE |
| Vetter Slough | Cass, IL | 40.4 miles | SE |
| Wood Slough | Cass, IL | 40.5 miles | SE |
| Boujan Swale | Cass, IL | 40.7 miles | SE |
| Deep Slough | Mason, IL | 40.8 miles | SE |
| Swamp Slough | Cass, IL | 40.9 miles | SE |
| Pickle House Slough | Clark, MO | 41 miles | SW |
| East Branch Illinois River | Mason, IL | 41.1 miles | SE |
| Dennis Slough | Hancock, IL | 41.2 miles | SW |
| Hager Slough | Cass, IL | 41.3 miles | SE |
| Kaufman Slough | Hancock, IL | 41.8 miles | SW |
| Snicarte Slough | Mason, IL | 41.9 miles | SE |
| Long Pond | Hancock, IL | 42.4 miles | SW |
| Hemp Slough | Clark, MO | 42.4 miles | SW |
| Whitney Slough | Hancock, IL | 42.7 miles | SW |
| Copper Slough | Hancock, IL | 43.1 miles | SW |
| Woodyard Slough | Fulton, IL | 43.1 miles | SE |
| Goose Slough | Fulton, IL | 43.8 miles | SE |
| Buckbrush Slough | Fulton, IL | 44 miles | SE |
| Taylor Slough | Hancock, IL | 44.3 miles | SW |
| West River | Fulton, IL | 44.5 miles | SE |
| Johnson Slough | Mason, IL | 45.7 miles | SE |
| Cutoff Slough | Hancock, IL | 45.9 miles | SW |
| Heiser Slough | Mercer, IL | 46.3 miles | NW |
| Theivaught Slough | Cass, IL | 46.4 miles | SE |
| Meyer Slough | Mercer, IL | 46.8 miles | NW |
| Fish Creek | Mason, IL | 47 miles | SE |
| Half Moon Slough | Mercer, IL | 47.1 miles | NW |
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