WEATHER AND RIVER DISCHARGE DATA 



Headwater and tailwater elevations are given 

 in feet above m.s.l. (nnean sea level) and are 

 plotted in figures 1 and 2. 



Air temperatures were taken twice daily by 

 maximum and minimum thermometer. A con- 

 tinuous record of water temperatures was 

 taken by thermograph at the middle fish lad- 



der. Daily records of weather and st re amflows 

 are shown in tables 9-14. 



Maximum daily discharge of 349,900 c.f.s. 

 (cubic feet per second) on June 18 was less 

 than the 1964 record of 451,900 c.f.s. on June 

 17 (fig. 3). 



Maximum water temperature of 66° F. oc- 

 curred August 12, September 7, 10-12, and 14, 

 In 1964, maximum water temperature of 64° F. 

 occurred August 18, 22, and 23. 



10 15 20 25 

 MAY 



5 10 15 20 25 

 JUNE 



10 15 20 25 



JULY 



5 10 15 20 25 



AUSUST 



5 10 15 20 25 

 SEPTEMBER 



5 10 15 20 25 



OCTOBER 



Figure 1. — Headwater elevations. Rock Island Dam, May 1 to October 15, 1965. 



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