The Basin

The Basin is a natural granite pothole in Franconia Notch State Park where Cascade Brook flows through a deep circular depression in the rock. The water continuously moves through this rounded cavity that has formed over thousands of years.

This pothole formed roughly 15,000 years ago when glacial meltwater rushed through the White Mountains during the last ice age. The grinding action of water and sediment carved out this rounded basin over an extended period.

The Basin draws visitors who want to witness how water shapes stone and understand the natural forces at work here. It has become a place where people connect with the raw power of nature in the White Mountains.

Access is straightforward from parking areas near Interstate 93, with a short level walk leading to viewing platforms. The water flow is strongest in spring and early summer, offering the most dramatic views of the swirling motion.

The water spins like a miniature whirlpool within this depression, continually polishing the granite walls smoother. This ongoing swirling motion shows how natural forces remain at work shaping the stone today.

Location: Grafton County

Location: Lincoln

Part of: Franconia Notch State Park

GPS coordinates: 44.12105,-71.68303

Latest update: December 6, 2025 19:07