The South Dakota State Cement Plant
Most cement plants in America were built by private companies. The one that rose in Rapid City was different. It belonged to the state of South Dakota, run as a public enterprise, and for the better part of a century it turned local limestone into the cement that paved roads and raised buildings across the northern plains. Few states ever owned an industrial operation of that kind, and fewer still kept one running as long as South Dakota did.
The plant was a product of a particular moment in the state’s politics. In the years around the First World War, South Dakota, like several states on the northern plains, embraced a wave of progressive and populist ideas about what government could do directly for its people. The thinking was straightforward enough. Cement was essential to building roads, dams, and public works, and the state was about to spend heavily on all of them. Rather than buy the material from distant private suppliers at whatever price they set, why not make it at home, control the cost, and keep the profit and the jobs within the state?
Limestone and gypsum at hand
Rapid City was a sensible place to build. The Black Hills and the ridges around the city held abundant limestone, the chief raw material of cement, and the gypsum the process required could be obtained in the region as well. This connection to local stone and minerals tied the plant to the same geological base that had supported the area’s earlier brickyards, quarries, and building-materials trades, which I describe in the story of early Rapid City industry. The city’s rail connections meant the finished cement could be shipped out across the state and beyond.
Construction took place in the early 1920s, and the plant began producing cement that decade. It was located on the edge of the growing city, its kilns and silos a visible presence for anyone passing through. Over the years it expanded its capacity to meet the demand of a state that was steadily building.
A public business in a private industry
Running a cement plant as a government operation was always a little awkward, and the venture drew its share of skeptics who doubted that a state could compete with private industry over the long run. Yet the plant endured. It supplied material for highways, bridges, dams, and countless private projects, and it employed a steady workforce in Rapid City for generations. The cement helped build the roads that carried tourists into the Black Hills and the structures that housed a growing population, especially during the Cold War expansion that I treat in the account of Rapid City’s postwar boom.
For decades the plant occupied an unusual niche, a profitable public enterprise that returned money to the state treasury while serving the building needs of the region. It became one of those institutions that local people simply took for granted, a fixture of the economy that had been there longer than most could remember.
The end of a long run
By the late twentieth century the calculus had shifted. The cement industry had consolidated, modern plants demanded heavy capital investment to stay competitive, and the question of whether the state should remain in the manufacturing business returned with force. In the 1990s South Dakota chose to leave it. The state sold the plant to a private firm, ending one of the longest experiments in state-owned industry the country had seen. The plant kept operating under private ownership, its kilns still drawing on the same Black Hills limestone.
The proceeds of the sale did not simply vanish into the general fund. The state set much of the money aside in a trust whose earnings have supported public purposes since, a quiet afterlife for an industrial venture that began in the optimism of the 1920s. The cement plant is remembered now less for any single building it helped raise than for what it represented, a time when a thinly populated western state decided it could make its own concrete and, for the better part of seventy years, proved itself right.