Environment: Your Guide to the Largest Superfund Complex in the Nation

Understanding Our Area Through Operable Unit’s (OUs)

The map below shows parts of Butte that are labeled as Operable Units. An operable unit is a section within a larger complex (such as Butte). This helps with the management of the site so that we know what area within the larger site we are talking about. Butte has 5 major operable units within the city.

• Rocker Operable Unit
• West Side Soils Operable Unit
• Butte Priority Soils Operable Unit
• Stream Side Tailings Operable Unit
• Butte Mine Flooding Operable Unit
• Warm Springs Ponds Operable Unit
• Montana Pole & Treating Plant Site
• Rocker Operable Unit

Learn About the History of Mining and Silver Bow Creek

The Montana Department of Environmental Quality put together an intensive StoryMap on the history of our area, click the link below to see it.

Link to DEQ Map