Now back to the present.
Top view by Bing. The south end of town was completely redone in 1970. A levee was built and Pottawatomie Av, formerly just a theory, became an active industrial and commercial street. There's Temple Lane, and there's the mansion.
Front view by Googlestreet, driving on Pott Av. Perspective drastically lengthened by Google; the previous map shows the driveway is about 100 feet long. Unquestionably the same mansion I saw in 1965 and the same mansion shown on the 1885 map, though it's been renovated with an added porch. An old brick mansion is highly unusual around Manhattan; nearly all the surviving old stuff is limestone.
But Temple Lane runs off to the side of the mansion, not down toward it. Here's a side view of the mansion FROM Temple Lane, with an old wellhouse or something in the foreground.
Temple Lane goes on and on through the old floodplain of Hunters Island, past farmland with a few rural houses that date from the '20s or so. You'd never know this was a mile from downtown! Clearly not haunted, but not eagerly sought by developers either. Manhattan has grown TREMENDOUSLY in the opposite direction, not at all to the south. Maybe floodplain rules prevent development because this is beyond the levee line.
Two hypotheses. I've built a stupid BlinkyGif with the current top view, then Hyp 1 added in orange, then Hyp 2 in violet. Bear in mind that Pott Av and all the industrial stuff wasn't there.
Hypothesis 1: (orange) The mansion's long driveway must have been a whole lot longer before 1970, because it had to reach all the way to Riley Lane (blue). Possibly the driveway was treated as an extension of 5th St. At that time Riley Lane wasn't named; it was just the 'drivable version' of Pottawatomie. I would have been driving on Riley Lane. I would have seen the two-block driveway and assumed that was Temple Lane. The real Temple Lane, perhaps just an unmarked set of ruts, was there but I didn't notice it.
Hypothesis 2: (violet) Maybe the driveway and Temple weren't separate intersections. Because the east end of Riley Lane was pretty much the end of Manhattan, maybe the mansion's driveway led to the mansion then branched off to Temple Lane. Unlikely.
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Later addendum, not especially helpful.... Found a couple of USGS topo maps, one from 1950 and one from 1965 or so.
This blinkyGIF gives a better sense of the 'informal' roads around the City Dump. Green arrow points to the mansion, violet arrow to the Mexican restaurant discussed here. Looks like I must have turned onto 'drivable Pott' aka 'Riley Lane' from Manhattan Ave, and then 'drivable Pott' turned into actual Pott, most likely without the clear corners shown on map. At the point where Temple Lane turns south, you're in the Dump.
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June 2017 addendum: The chimney was the remnant of a steam flour mill.
Labels: new toy
The current icon shows Polistra using a Personal Equation Machine.