I'm down here in Austin and the few times I've been to Dallas, I have noticed these, (hard to describe)concrete "pillars" that look like they were left over from some failed elevated road project.
I think they are located on the west side of Dallas near the movie studios.
I think you are talking about the Los Colinas business park area on HWY 114 about 5miles west of I35. It is the monorail commute system they were going to put in before the economy feel in the mid 80. Along with the canals and boats. Office space became surplus and all the construction sky crane came down and have never come.
Yes they had, and may still have water taxi's running around the canals to move people from building to building and parking lot. It main purpose now is tourism and I beleive they quit running probably mid 90s. The water for the canal comes from the elm fork of the trinity river. The concrete pilliar for the monrail is as far as they got. Boom then the oil industry and economy went bust. You could look at it more closely with goggle earth.
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