Credit: Siouxland Museums / Photo ca. 1980 of Northern States Power's North Weber plant that once sat at the base of the city's namesake falls. The quartzite section is the original 1908 Sioux Falls Light & Power Co. hydro plant, then the additions were put up by Northern States Power over the years until the 1940s, when the Lawrence plant was built east of town. Both were shut down December 31, 1972, and while I do not know when Lawrence hit the ground, I remember seeing this plant in pretty forlorn condition in the late 1980s before most of the complex was torn down in 1990, leaving only the hydro plant. The substation on the south side of the hydro plant came down in 1991, and the city has since restored the hydro building into the Falls Overlook Cafe.