This marker commemorates the line of 100 degrees west longitude, a geographic division that became culturally associated with the transition toward the drier Great Plains. Cozad itself was named for the meridian, turning an invisible coordinate into a routeable roadside history stop.
Filed under roadside oddities: giant objects, odd monuments and things built for no clear reason.
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Source: history.nebraska.gov/marker-monday-the-100th-meridian/