This news article says they're gone:
http://www.marnieko.com/towers.htm (dated Sept 10, 2001)
But I would think that they are back if the Lloydminster city site has
them on their website.
This got me thinking about Jesper's question as to the actual location
of the border. I doubt Alberta would build a highway right on the
border. My thinking is that the border should be on the east side of
the highway. Of course, as our border expeditions have shown, borders
don't follow logic!
Doug