If you’ve ever driven along County Road 46 in Rosemount, MN and caught a glimpse of those odd, T-shaped concrete structures poking up from the trees, you’re definitely not alone in wondering what the heck are those things?
They look like the start of some forgotten overpass, or maybe the ruins of an abandoned sci-fi set, but the truth is something you probably might never guess.
What are those weird T-shaped concrete walls on County Road 46?
Those mysterious concrete giants are called the “T-Walls” and are remnants of a top-secret World War II-era facility called the Gopher Ordnance Works.
Back during the 1940s, the U.S. Army built this massive munitions plant that sprawled across more than 11,000 acres in Rosemount and nearby Coates. The purpose of the plant was to crank out smokeless gunpowder for the war effort to power everything from rifles to artillery.
So, where do the T-shaped walls come in?…