Item 89842 - Pennell property, Bay Avenue, Great Diamond Island, Portland, 1924 Item 89842 - Pennell property, Bay Avenue, Great Diamond Island, Portland, 1924 Contributed by City of Portland - Planning & Development Item 89842 Zoom 4728px x 3455px - 15.8"w x 11.5"h @ 300dpi | Need a larger size? *Credit line must read: Collections of City of Portland - Planning & Development Image Info Summer Dwelling at Bay Avenue in Great Diamond Island, Portland, was owned by Maud A. Pennell in 1924. Mary E. Pennell Show Details