2011 Map of Jefferson Island

About this map

Boulder Valley serves as a critical junction where the Jefferson River meets the South Boulder River and Boulder River, creating a complex landscape of riparian channels and irrigation infrastructure. The local economy and land use are clearly defined by these water sources, evidenced by an extensive network of human-made waterworks including the Bricker Sparrow Ditch, North Fork Missouri Ditch, and Church Ditch. This 2011 survey documents a mix of agricultural heritage and industrial activity, with several mining operations such as the Oliverson Mine and La Hood Park Mine dotting the terrain near La Hood Park. Settlement is concentrated around Cardwell, featuring the Cardwell Post Office, and Jefferson Island, while the high ground is dominated by features like London Peak and Cave Mountain. Genealogy and local history researchers can locate the South Boulder Cemetery situated off Cemetery Hill Rd, providing a specific anchor for family history in this Montana river valley.