RIVERS AND CREEKS (STREAMS) FISH DATA SUMMARIES FOR MAJOR RIVER BASINS IN ILLINOIS
| BASIN CODE | BASIN NAME |
| A (OHR) | OHIO RIVER BASIN |
| AD | CACHE RIVER BASIN |
| AT | SALINE RIVER BASIN |
| B (WBR) | WABASH RIVER BASIN |
| D (ILR) | ILLINOIS RIVER BASIN |
| MSR | MISSISSIPPI RIVER BASIN |
| N | BIG MUDDY RIVER BASIN |
| O | KASKASKIA RIVER BASIN |
| P | ROCK RIVER BASIN |
