304 



PATTERSON-SIMMONS. MODEL STUDIES 



[Ch. 17 



Pryors Island and Sisters Island back channels were more effectively- 

 diked, and the existing dikes between these islands were raised and ex- 

 tended. The channel opposite Pryors Island was shifted from the 



I L L I N O I S 



KENTUCKY 



Fig. 2. River survey of 1930, Pryors Island Reach model study. 



I LLINOIS 



KENTUCKY 



Fig. 3. Recommended plan, Pryors Island Reach model study. 



right bank to the left by dredging to a 12-foot depth at the beginning 

 of the test. The seven spur dikes opposite Sisters Island were com- 

 pletely removed. A group of spur dikes was constructed above Stew- 

 arts Island and another group above Dog Island. No dredging was 

 done in the model except during the first of the 7 years reproduced in 



