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These "islands" refer to elevations above plain of Chicago. As the glaciers retreated and flood waters filled the area about 12000 years ago, they probably did stand out as true islands for a while. Although not too high! From http://ebeltz.net/folio/cfol-1.html "The city of Chicago is situate on a low, strikingly flat, crescent-shaped plain bordering the head of Lake Michigan. At the north end of this crescent is Winnetka, on the lake shore, about 8 miles north of Chicago. From here the plain broadens southward, attaining a width of 12 to 15 miles in a southwesterly direction from the city, whence it again narrows as it passes eastward about the head of the lake. From the shores of Lake Michigan, the surface of which is about 581 above mean tide level, this plain rises gradually to a nearly uniform height at its inner margin, about 640 feet above tide, or about 60 feet above Lake Michigan. The most prominent topographic feature of the plain is Blue Island Ridge, 7 miles west of the lake at South Chicago. This ridge extends due north and south, having a length of 6 miles, a width of about 1 mile, and an elevation of 25 to 50 feet above the surrounding flat. Just west of South Chicago, between Blue Island Ridge and the lake, is an elevation of rock known as Stony Island. Its longer axis has an east-west direction. The length of the "island" is 1.25 miles, it width one-half a mile, and its height about 20 feet above the surrounding marshy area. The north side of Chicago, between North Branch of the Chicago River and Lake Michigan, is also occupied by two broad elevations rising 30 to 40 feet above the lake. " I think this last reference is what gives rise to Ridge Ave.

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โˆ™ 2008-10-13 23:02:37
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Q: Why was blue island named blue island?
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