The park contains over 200 glacial potholes formed by swirling, gravel-laden meltwater from retreating glaciers.
The Bottomless Pit pothole extends approximately 60 feet deep into the basalt rock.
The St. Croix River valley at this location is part of a series of ancient basalt lava flows dating back 1.1 billion years.
This site was established as Minnesota's first state park in 1895.
The park serves as the southern terminus for the North Country National Scenic Trail in Minnesota.
Interstate State Park is one of the only parks in the U.S. that consists of two separate state parks located directly across from one another on a state line.
Interstate State Park is situated on the St. Croix River, marking the border between Minnesota and Wisconsin. The park is defined by its deep, narrow gorge carved through basalt lava flows during the last glacial retreat. It features an extensive collection of glacial potholes, some of which are among the deepest in the world. The terrain is rugged, characterized by sheer rock cliffs that tower over the river's Dalles. It serves as a primary access point for the St. Croix National Scenic Riverway. Visitors can explore various hiking trails that provide views of the river and basalt formations. The park is managed in conjunction with a namesake park on the Wisconsin side of the river.
The overlook platform at the end of the Pothole Trail provides a clear view into the deepest glacial features and the river gorge.
Wear sturdy, closed-toe hiking boots with good traction as the basalt rocks around the potholes can be slippery.
Bring binoculars for observing rock climbers on the cliff faces and migratory birds along the river corridor.
Check water levels before visiting if you plan to kayak, as currents in the Dalles can be deceptively strong.
Attempting to climb the basalt cliffs outside of designated areas or ignoring safety barriers near the edge of the gorge.
Park grounds are open year-round, but specific visitor center hours vary seasonally.
Stay on marked trails to protect fragile vegetation; rock climbing is permitted only in designated zones with proper equipment.
