----- Original Message -----
From: "adamnvillani" <avillani@...>
To: <BoundaryPoint@yahoogroups.com>
Sent: Wednesday, December 10, 2003 9:22 PM
Subject: [BoundaryPoint] Re: mxn trip?

> --- In BoundaryPoint@yahoogroups.com, "Lowell G. McManus"
> <mcmanus71496@m...> wrote:
>
> > The geodesic segment originally terminated at the confluence of the
> rivers,
> > which was then somewhere in the bottoms northeast of what is now
> downtown Yuma.
>
> I believe you are correct. Checking out the City of Yuma's website
> shows some old photographs that show Fort Yuma located on the bluff
> on the opposite side of the Colorado, at the confluence of the two
> rivers. If you look at the landforms, too, it seems more likely that
> the location of the confluence changed along the floodplain there
> rather than the low mesa the town sits upon.
>
> In other words, the line started at the confluence of the two rivers,
> but the border started where that line crossed the Colorado.
>
> I wonder how the western end of that line was chosen. It seems likely
> that it was just chosen as a location that allowed for the area
> around San Diego Bay to be in the USA but not much more. Seems odd
> that they didn't set the border on the Pacific at, say, the mouth of
> the Tijuana River, which would be a couple miles north of where it is.
>
> While we're at it, I wonder what the history of the geodetic line
> that forms the WNW/ESE southern border of Arizona/Gadsden Purchase
> is. How was it chosen? A map of Baja California shows Mexico Hwy. 2
> extending for about 15 miles WNW of the azbcso tripoint, roughly
> along the same alignment as the WNW/ESE line in question. Hmm.
>
> Adam
>
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