Could this be the prototype, the inspiration for the Great US-Canada Wall? Walker's community of Wauwatosa, WI is just a few blocks to the right (north) of this wall going up on I-94. I shot this on the way to the Waukesha water hearing last week.
"A little fill here and there may seem to be nothing to become excited about. But one fill, though comparatively inconsequential, may lead to another, and another, and before long a great body may be eaten away until it may no longer exist. Our navigable waters are a precious natural heritage, once gone, they disappear forever," wrote the Wisconsin Supreme Court in its 1960 opinion resolving Hixon v. PSC and buttressing The Public Trust Doctrine, Article IX of the Wisconsin State Constitution.