Portland Brownstone Quarries

Portland Brownstone Quarries is a mining site along the Connecticut River featuring deep excavations in reddish-brown sedimentary rock. The landscape shows multiple cut areas where workers removed stone blocks over centuries of operation.

Quarrying began in the late 1600s and expanded as brownstone became a sought-after building material for East Coast cities. Operations ended in 1938 when floods permanently submerged the excavation sites, stopping all extraction work.

The stone extracted here shaped the appearance of major East Coast cities, giving them distinctive reddish-brown facades seen on countless buildings. These structures serve as a living record of the generations who quarried and shaped the material by hand.

The site is now accessible through Brownstone Exploration & Discovery Park, where visitors can try water sports and rock climbing activities. The warmer months offer the best conditions for outdoor and water-based activities at the location.

The quarry walls preserve ancient footprints left by prehistoric reptiles, embedded within the sediment layers for millions of years. These imprints reveal that the site was once an ancient riverbed before becoming an extraction area.

Location: Connecticut

GPS coordinates: 41.57556,-72.64333

Latest update: December 8, 2025 19:59