Item 88794 - Whitney property, Echo Point, Great Diamond Island, Portland, 1924 Item 88794 - Whitney property, Echo Point, Great Diamond Island, Portland, 1924 Contributed by City of Portland - Planning & Development Item 88794 Zoom 4794px x 3419px - 16.0"w x 11.4"h @ 300dpi | Need a larger size? *Credit line must read: Collections of City of Portland - Planning & Development Image Info Wharf at Echo Point in Great Diamond Island, Portland, was owned by Joseph W. Whitney in 1924. Private Wharf Permanent Residence, 22 Clifford Street, Portland Show Details