Swimmers take the plunge in this undated photo during the pier's early days as an amusement park. The pier opened to much fanfare in July 1916.

Swimmers take the plunge in this undated photo during the pier’s early days as an amusement park. The pier opened to much fanfare in July 1916.
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( Chicago Tribune photo archive, Chicago Tribune photo archive / January 8, 2012 )

Swimmers take the plunge in this undated photo during the pier’s early days as an amusement park. The pier opened to much fanfare in July 1916.