Mississippi River South Temperature

Section 303 Section 303.361  Mississippi River South Temperature Instead of the standards of 35 Ill. Adm. Code 302.211(e), the water temperature at representative locations in the main river of the Mississippi River from the Kaskaskia River to the Ohio River must not exceed the maximum limits in the following table during more than 1% of the hours in the 12-month period ending with any month.  The water temperature at these locations must not at any time exceed the maximum limits in the following table by more than 1.7 ºC (3 ºF). ºC ºF ºC ºF JAN. 10 50 JUL. 32 89 FEB. 10 50 AUG. 32 89 MAR. 16 60 SEPT. 31 87 APR. 21 70 OCT. 26 78 MAY 27 80 NOV. 21 70 JUN. 31 87 DEC. 14 57