LAKE CHICAGO AND ITS OLD SHORE LINES 89 



portage from the Chicago River to the Desplaines was fixed 

 within the present city limits, Chicago's site was practically 

 settled. Even the locations of our fashionable residence sec- 

 tions, streets, railroad approaches, recreation parks, and sewage 

 system were more or less completely settled by the deposits of 

 moraines, locations of old beach lines, sand spits, and dunes of 

 the old glacial lake. 



