
The confluence of the Gallatin River, Madison River, and Missouri River anchors this postwar landscape, where the convergence of major waterways and competing rail lines defined the region's development. The Northern Pacific and the Chicago Milwaukee St Paul and Pacific railroads parallel these rivers, serving industrial sites like the cement plant at Trident and agricultural hubs such as Manhattan. The mapping captures a network of complex irrigation systems, including the Warm Springs Canal and Lowline Canal, which transformed the valley floor into productive ranching land.
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