1950 Map of Jefferson Island

About this map

The Jefferson River and Boulder River converge in this high-plains landscape, where the confluence creates a natural hub for early 1950s infrastructure. The Northern Pacific and Chicago Milwaukee St Paul and Pacific railroads parallel the water, serving the agricultural and mining interests of the London Hills. Cultural landmarks such as Lewis and Clark Cavern State Park and the South Boulder Cemetery anchor the local geography, while the presence of the Eureka School and numerous family holdings like Heule Ranch and Tribble Ranch reflect a well-established ranching community. The map also records industrial history through the Mayflower Mine and a Gypsum Mine (Aband), illustrating the shifting economic priorities of the era. Settlement is concentrated at Cardwell and Sappington, points that mark the intersection of rail transport and rural mountain life.