Lake Super I or 



Power Diversion around 



rower Diversion orouno— i 



St.Morys Ropids Full Regulolion Slorted 



I — Long Lode Diversion Storied 

 -Ogoki Diversion Storied 



2 - Ctiorl Dotum 600.0 ft (182. BSm) 



(ft) I 

 



Lake Michigan -Huron 



An Average of 500 ftVs Into — pChicogo Diversion Increases pAveroge Chicago Diversion 

 Mississippi River of Chicago to 10,000 It'/s 3.200 fiVs 



Lake Erie 



(ft) 2 



•Chort Ootum 568.6 ft (173.31 m) 



I I I I I L 



Lake Ontario 







Gut Dom Completed— 1 





Gut Dom Removed— 1 



r-St.Lowrence 

 Completed 



beo 



4 



_ 







/ 







3 



(\ 



\^l\ A. /Aa 



. A A 



. f\ hA\ 



A/ 



\, 



(ft) 2 



1 

 



- 



^V^\TVV 



\J 



rr 



V 



■ Chorl Dotum 242.8 fl ( 74.01 

 1 1 1 1 



ml 



1 



1 ..,,1. 1 1 — 



1 ....:.± 



-L 



1.5 



- 1.0 



(m) 



1920 

 (Yr) 



1940 



I960 1978 



Figure 2. Mistoric cPianges in annual mean v;ater levels on 

 the Great Lakes, 1860 to 1978. 



