With all of the grain flowing through the Twin Ports in the late 19th-century, it only made sense to build some flour mills along their shores. Superior actually out did Duluth when it came to Flour mills when it came to the amount of mills operating withing their orders, , but the largest and most sophisticated flour-making facility was Duluth’s Imperial Mill, which competed with Pillsbury’s A Mill in Minneapolis to see which mill could grind grain the fastest. But thanks to conglomeration at the turn of the century, the mill was shuttered. Read the fascinating history of Duluth’s Imperial Mill here, take a look inside the mill ca. 1990 here, and learn about how the mill interfaced with Duluth’s railroads here.