Ill. Admin. Code tit. 35, § 303.301
Subpart C is arranged by river basin as follows:
| River Basin | Reserved Section Numbers | |
| Ohio | Section 303.310-Section 303.319 | |
| Wabash | Section 303.320-Section 303.329 | |
| Mississippi | ||
| North | Section 303.330-Section 303.339 | |
| North Central | Section 303.340-Section 303.349 | |
| South Central | Section 303.350-Section 303.359 | |
| South | Section 303.360-Section 303.369 | |
| Rock | Section 303.370-Section 303.379 | |
| Kaskaskia | Section 303.380-Section 303.389 | |
| Big Muddy | Section 303.390-Section 303.399 | |
| Illinois | Section 303.400-Section 303.409 | |
| Sangamon | Section 303.410-Section 303.419 | |
| Kankakee | Section 303.420-Section 303.429 | |
| Fox | Section 303.430-Section 303.439 | |
| Des Plaines/Lake Michigan | Section 303.440-Section 303.449 |