I've superimposed several maps to locate my land relative to the city in 1806. As well, I was able to locate the infamous powder house. As you can see, it was behind what is now #10 McDougall St.
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Eastaff's 1806 map (detail)
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2003 Map from the city's interactive map site
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My Superimposition of the two.
It is also interesting to see how the Dalton grant map corresponds to the other two.
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The map on the Dalton grant
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The grant map superimposed on a modern map.
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The grant and Eastaff maps superimposed.