1940s Cross Rock, Interstate Park, St. Croix Falls, Wisconsin

Step into the rugged beauty of the St. Croix River Valley with this vintage postcard featuring “The Cross,” a striking rock formation within Interstate State Park. Rising from the river gorge, the ledges are part of ancient lava flows, known as trap rock, with seven distinct layers forming dramatic steps and vertical precipices that have drawn hikers, artists, and nature enthusiasts for over a century. The formation exemplifies the geologic richness of the park, which straddles the Wisconsin–Minnesota border and includes the world-famous glacial potholes that define the landscape.

Established in 1900 on the Wisconsin side near St. Croix Falls, Interstate State Park is the state’s oldest park and a popular destination for hiking, sightseeing, and exploring the historic St. Croix River corridor. The park’s dramatic cliffs, isolated crags, and the deep river gorge have made formations like “The Cross” a favorite subject for early- to mid-20th-century postcards, capturing the scenic grandeur of the region for visitors near and far.

This natural color postcard was produced by E. C. Kropp Co. of Milwaukee, Wisconsin, and published by the St. Croix Post Card Co., reflecting the era’s attention to vivid, realistic depictions of America’s landscapes. A beautiful addition to any collection of Wisconsin scenery, geological formations, or early travel postcards, it would display wonderfully framed as a window into mid-century appreciation of natural wonders.

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