Dallas Fort Worth Urban Forum

I-345

I45Tex
Posts: 311
Joined: 26 Jan 2017 05:52

I-345

Postby I45Tex » 10 Jan 2020 08:08

Probably some on this forum have seen the area around Sears Tower where the city streets are all overpasses above ground level, with the buildings' underground service levels actually built in the open air at ground level. The development of Illinois Center, Lakeshore East and Millennium Park over former railyards saw this taken to another level (with two layers of service streets under the city sidewalk). Discussions of I-345 have generally presented either a costly Big Dig, a modification and updating of the status quo, or its replacement with a boulevard and the crosstown traffic can take Loop 12 or 635 or stay home. Sadly none of these is particularly adequate for a city like Dallas.

The only option that gets us closer to where we want to be while allowing us to be where we are in the meantime would be a fourth option. Let's start improving that option: Tear down 345. Rebuild the lanes immediately, with rapid crane installation of large pre-prefabricated concrete units from one or more adjacent staging yards. But rebuild it now within chest height of ground level, using its current alignment as an end-to-end through route without more than a couple of local on- and off-ramps if any. Simultaneously, build sufficient columns between the north- and south-bound halves that the treelined urban boulevard level will be 20' above the mainlanes of new-345. Its substructure is built now, to be finished on top without need for any later closures of I-345. In phases, as concurrently as practicable, Canton, Main, and the rest of the streets between Deep Ellum and downtown would need to be built up to new ground-level intersections with CTroyMathis Blvd. It can get lined with apartments, civic buildings and workplaces on both sides whose loading docks require no sidewalk cuts, being 20' below the street at ground level.

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Hannibal Lecter
Posts: 565
Joined: 19 Oct 2016 19:57

Re: I-345

Postby Hannibal Lecter » 10 Jan 2020 10:47


I45Tex
Posts: 311
Joined: 26 Jan 2017 05:52

Re: I-345

Postby I45Tex » 10 Jan 2020 10:54

Somewhere in Calatrava's drawings that I saw at the Meadows Museum is a sketch of Elwood and Jake soaring between the gates of a bascule Margaret Hunt Hill Bridge.

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electricron
Posts: 286
Joined: 29 Oct 2016 11:07

Re: I-345

Postby electricron » 10 Feb 2020 12:30

I45Tex wrote:Probably some on this forum have seen the area around Sears Tower where the city streets are all overpasses above ground level, with the buildings' underground service levels actually built in the open air at ground level. The development of Illinois Center, Lakeshore East and Millennium Park over former railyards saw this taken to another level (with two layers of service streets under the city sidewalk). Discussions of I-345 have generally presented either a costly Big Dig, a modification and updating of the status quo, or its replacement with a boulevard and the crosstown traffic can take Loop 12 or 635 or stay home. Sadly none of these is particularly adequate for a city like Dallas.

The only option that gets us closer to where we want to be while allowing us to be where we are in the meantime would be a fourth option. Let's start improving that option: Tear down 345. Rebuild the lanes immediately, with rapid crane installation of large pre-prefabricated concrete units from one or more adjacent staging yards. But rebuild it now within chest height of ground level, using its current alignment as an end-to-end through route without more than a couple of local on- and off-ramps if any. Simultaneously, build sufficient columns between the north- and south-bound halves that the treelined urban boulevard level will be 20' above the mainlanes of new-345. Its substructure is built now, to be finished on top without need for any later closures of I-345. In phases, as concurrently as practicable, Canton, Main, and the rest of the streets between Deep Ellum and downtown would need to be built up to new ground-level intersections with CTroyMathis Blvd. It can get lined with apartments, civic buildings and workplaces on both sides whose loading docks require no sidewalk cuts, being 20' below the street at ground level.


Ever wondered why Chicago built two and triple level streets in just a fairly small part of downtown Chicago?
https://en.wikipedia.org/wiki/Multileve ... in_Chicago
Flooding, it was built over a swamp where the Chicago River emptied into Lake Michigan. Separating local from through traffic was of minimum concern.
Is there a swamp in Deep Ellum worthy of the expense to rebuild all the buildings because the roads will be rebuilt multilevel?

I45Tex
Posts: 311
Joined: 26 Jan 2017 05:52

Re: I-345

Postby I45Tex » 10 Feb 2020 16:34

...the street level from one side of the interstate boulevard to the other would be in section like an overpass. The only regrading of entrance levels would take place on the one or two blocks to either side of it, and many of them are going to receive major new buildings in the next wave of construction anyway.


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