Hibbing Disposal Plant

Hibbing, United States

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Heritage registerNational Register of Historic Places↗

The Hibbing Disposal Plant in Hibbing, Minnesota, was a sewage treatment facility built from 1938 to 1939 as a Public Works Administration project during the Great Depression. Designed in Moderne architectural style, the plant featured two of the world's largest self-supporting reinforced concrete domes, engineering innovations that housed its trickling filter system. Listed on the National Register of Historic Places in 1991, it was recognized for its significance as one of the largest PWA projects in northern Minnesota and as a landmark of modern sanitation infrastructure brought to communities through New Deal programs. The city gradually phased out operations in the early twenty-first century, and the historic structures were razed by 2012, leaving only later non-historic additions.