As of May 5, 2017, the Pit’s water level was 5,339.30 feet above sea level.
When water levels at one of the monitoring compliance points around the Pit reach the Critical Level of 5,410 feet, pumping and treating of Pit water will begin. Current projections estimate that the Critical Level will be reached around 2023. Full monitoring reports and data are also available. The current level is 70.7 feet below the Critical Level.
This image illustrates how Berkeley Pit and compliance point water levels, with the lowest elevations in the area, act as a sink that collects groundwater. The Pit water level is from August 2015. The image also includes a timeline of important Berkeley Pit dates, past and present. Click on the image to view a larger version.
Selected Berkeley Pit groundwater monitoring locations and water levels, including wells and abandoned mine shafts, August 2015.
The illustration above shows water levels in the Berkeley Pit and Pilot Butte mine shaft (a monitoring compliance point) over time. The Pit has been filling with water more slowly than predicted in the 1994 EPA Record of Decision for the site.
This image illustrates how the Berkeley Pit, with the lowest water levels in the area, acts as a sink that collects groundwater. Water levels indicated for each monitoring point are from June 2013. Click on the image to view a larger version.