The Portlands' (CA33 Portland and CA35 Indianapolis) design we're improved from the previous Northampton class. Indianapolis was designed as a flagship thus have an extended forecastle deck for extra crew accommodations. Note CA33 has a higher forward funnel than CA35 Indianapolis.
http://en.wikipedia.org/wiki/Portland-class_cruiser
http://en.wikipedia.org/wiki/USS_Portland_(CA-33)
http://en.wikipedia.org/wiki/USS_Indianapolis_(CA-35)