Description:  The flag of the City of 
Portland is an offset cross of light 
  blue, edged by white-yellow-white stripes, with a white four-pointed star in 
  the left center, all on a background of Kelly green. The official size, 
  proportions, and color elements in the City Flag are specified in the Portland 
  City Code 1.06.010 (
http://www.portlandonline.com/auditor/index.cfm?&c=28155).
 
   
  History: In 1969, at the suggestion of Mayor Terry Schrunk, the 
  Portland Art Commission established a special committee to select a designer 
  for an official city flag.  It chose Douglas Lynch, former president of the 
  Art Commission and a prominent local graphic design professional and teacher.  
  After extensive research and consultation with art commission members and city 
  commissioners, he proposed a design in a process he called “as much diplomatic 
  as it was artistic”.  The Portland City Council adopted the flag in January 
  1970.  In 2002, with the encouragement of the Portland Flag Association, Mr. 
  Lynch simplified and improved the design, and the revised version was adopted 
  by Ordinance 176874 on September 4, 
  2002.
   
  Symbolism:  Gre