• What is the current water level in the Pit?

  • Study details slope stability

  • Water level rising more slowly than originally projected

  • Drones in the works for water quality sampling

  • Plan for treatment technology assessment

  • Following up on the EPA’s 2010 five-year review

  • Maps of Berkeley Pit Monitoring Sites

  • Computer Model Shows Berkeley Pit & Butte Mine Tunnels

  • Current and Critical Water Level Comparison

  • Berkeley Pit slough

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

View All

What is the current water level in the Pit?

Wednesday, September 16, 2015

As of December 11, 2015, the Pit’s water level was 5,330.71 feet above sea level. When water levels at one of the monitoring compliance points around the […]


Study details slope stability

Wednesday, September 16, 2015

The rate of rise of water levels in the Berkeley Pit and connected monitoring points is affected by many factors, including rain and snowfall and […]


Water level rising more slowly than originally projected

Wednesday, September 16, 2015

Since the Berkeley Pit was designated as a Superfund site in the 1980s, things have gone largely as expected. In one instance the site remedy […]



View All

Berkeley Pit Water Levels & Monitoring

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