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A surveyor laying out a grid has two choices. Either let the streets get closer together as they head towards the North Pole, meaning the building lots get smaller and thus would be sold for less money, or readjust the grid at intervals so that the lots and the profits don't shrink.
Chicago opted for the second choice. The abrupt readjustment, or so the story has it, is manifested most conspicuously at North Boulevard, which was at one time the northern boundary for the City of Chicago.
|Looking North on Pulaski Road (old Crawford Avenue) towards North Avenue, Chicago - 1947|
The surveyors who laid out the city south of North Avenue appeared to have been a bit inaccurate. Harlem Avenue, the city’s western border at that time, is 1/16 miles west of where it should be at Madison Street. That's 330 feet. Just guessing, but if one had to hide a 330-foot mistake, they may parcel it out in small increments along the 5-mile width.
It's not like this is the only surveyor's error in Chicago. The whole city is 1.3° off true north. As a result, it doesn't square with the survey grid between the Wisconsin border and Central Street in Evanston, which was laid out independently.
EVIDENCE: Central and Golf Road is supposed to be parallel. However, if you follow the lines in a Street atlas, you’ll find Central and Golf are 1½ miles apart in Hoffman Estates, but only ½ mile apart in Evanston.
At the time of the survey, who cared about such a small difference? They thought they were surveying farm property lines. They couldn’t imagine what the future would bring.
ADDITIONAL READING: Chicago's Eastside Begins at North Boulevard (1600N)
Compiled by Neil Gale, Ph.D.