The Oklahoma Scenic River Commission recommends the following actions when water levels are above normal.

5 feet 6 inches - children 10 and under not go in canoes and switch to rafts.

6 feet - all switch to rafts.

7 feet - children 10 and under not go in rafts.

9 feet 6 inches - all floating must cease.

You can check the current water conditions here Illinois River conditions.