Berkeley Pit Overlook | Butte

Information

Landmark: Berkeley Pit Overlook
City: Butte
Country: USA Montana
Continent: North America

Berkeley Pit Overlook, Butte, USA Montana, North America

The Berkeley Pit Overlook provides a vantage point for viewing the Berkeley Pit, a former open-pit copper mine located in Butte, Montana, USA.

Visual Characteristics

The Berkeley Pit is a large, man-made excavation. Its dimensions are approximately 1 mile (1.6 km) long, 0.5 miles (0.8 km) wide, and over 1,700 feet (520 m) deep. The pit contains acidic water with a pH between 2.5 and 3.5, giving it a distinct turquoise to reddish-brown color due to dissolved metals such as copper, iron, and aluminum. The surrounding landscape consists of exposed rock faces and tailings piles.

Location & Access Logistics

The Berkeley Pit Overlook is situated approximately 2 miles (3.2 km) southeast of Butte's city center. Access is via Interstate 15, taking Exit 128 (Harrison Avenue). Follow Harrison Avenue south, then turn left onto Continental Drive. The overlook is clearly marked. Parking is available at the designated overlook area. No public transport directly serves the overlook.

Historical & Ecological Origin

The Berkeley Pit was developed by the Anaconda Company, with mining operations commencing in 1955 and ceasing in 1982. It was one of the largest open-pit copper mines in the United States. The pit's current state is a result of groundwater filling the excavation after mining operations stopped, leading to the formation of a highly acidic and metal-laden lake.

Key Highlights & Activities

Observation of the pit's scale and water coloration. Educational displays detailing the mine's history and environmental remediation efforts are present at the overlook. Photography of the pit and surrounding landscape is permitted.

Infrastructure & Amenities

The overlook features a paved viewing platform, informational signage, and a small parking area. Restrooms are available. Shade structures are present. Cell phone signal (4G/5G) is generally available.

Best Time to Visit

For optimal lighting conditions for photography, late morning or late afternoon provides angled sunlight that highlights the pit's textures and water color. Weather is generally best from May through October, avoiding winter conditions which can obscure views and create hazardous access.

Facts & Legends

The water in the Berkeley Pit is so acidic that it can dissolve metal. A notable incident occurred in 1995 when a flock of over 300 snow geese landed on the pit's surface and died within hours due to the corrosive water.