MEAN WATER TEMPEISATUJIC-S 



or 80 - 



S ■'0 



a 



o 



S 60 - 



+ 3-1 

 + 2 - 



+ 1 



^ >S 



^ 



W^ 



^^ 



1 -J 



WATC-R LCYELS 



-v^ 



-^-z* 



^=^-., ^^^V- 



MAY JUNE JULY AUGUST SEPT 

 1 I I I 



Fig. 5—Fluctuation in water levels and mean water temperature in Pool S of the 

 Mississippi River durint^ the suiimer of 194?.. "0" water level in normal 

 pool staf^. 



u 



