• What is the current water level in the Pit?

  • Maps of Berkeley Pit Monitoring Sites

  • Computer Model Shows Berkeley Pit & Butte Mine Tunnels

  • Current and Critical Water Level Comparison

  • Berkeley Pit slough

  • Do Butte residents need flood insurance?

  • What is being done to manage the Berkeley Pit now?

  • How is the Pit monitored?

  • What was the waterfall on the northeast wall of the Pit?

  • What is the Horseshoe Bend Water Treatment Plant?

The Berkeley Pit is a former open pit copper mine in Butte, Montana. Approximately 320 million tons of ore and over 700 million tons of waste rock were mined from the Butte Hill. Put another way, the Berkeley Pit and Butte mines produced enough copper to pave a four-lane highway four inches thick from Butte to Salt Lake City and 30 miles beyond. Today, the Pit is filling with highly contaminated water, and managed as a federal Superfund environmental cleanup site.

latest articles

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What is the current water level in the Pit?

Wednesday, March 19, 2014

As of March 3, 2014, the Pit’s water level was 5,315.51 feet above sea level. The water rose about 0.6 feet in the past month, and […]

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Maps of Berkeley Pit Monitoring Sites

Tuesday, January 7, 2014

Maps from the Montana Bureau of Mines & Geology (MBMG) showing Berkeley Pit-related alluvial and bedrock monitoring sites have been added to PitWatch.Org. View snapshots of […]

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Computer Model Shows Berkeley Pit & Butte Mine Tunnels

Friday, September 20, 2013

The Montana Bureau of Mines & Geology (MBMG) developed this computer model showing Butte topography and the corresponding underground tunnels from the years of historic […]

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Berkeley Pit Water Levels & Monitoring

Illustrated information regarding Berkeley Pit water levels and monitoring compliance point water levels around the Pit

Time Lapse of the Berkeley Pit, 1984-2012

from the Google Earth/Time Magazine Web App