Pennsylvania's 'Grand Canyon' Shines in New Landsat Image
A Landsat 8 image captured on October 25, 2026, shows Pine Creek Gorge, the 45-mile canyon known as the Grand Canyon of Pennsylvania, at the height of its autumn foliage. The feature reaches depths of about 1,500 feet and owes its southward course to glacial damming during the last ice age.
NASA
NASA's Landsat 8 satellite captured a vivid view of Pine Creek Gorge on October 25, 2026, as autumn colors spread across north-central Pennsylvania. The image, acquired by the satellite's Operational Land Imager, shows the canyon at the time of year when summer greens give way to the reds and golds that draw leaf peepers to the region.
Nicknamed the Grand Canyon of Pennsylvania, the gorge stretches roughly 45 miles (72 kilometers) through the forests of the Allegheny Plateau, running from Ansonia south to Pine Creek's confluence with the West Branch Susquehanna River. It reaches depths of about 1,500 feet (460 meters), with its greatest depths near Waterville. Unlike the bare rock walls typical of canyons in the desert Southwest, its dramatic slopes are outlined by lush vegetation.
Glaciers played a key role in the canyon's formation, though the ice itself did not carve it. Pine Creek once flowed north, the opposite of its course today. During the last ice age, glaciers advancing into the region from the northeast dammed the river and filled the valley with lakes. When those lakes eventually overflowed, water began streaming to the south.
By the time the ice receded, Pine Creek was already becoming entrenched in its southward course, and rocks and sand left behind by the melting ice prevented the water from turning back north. Glacial meltwater continued to rush through the valley, deepening it and shaping the topography visible today.
The hillsides around the gorge are now blanketed in northern hardwood and mixed oak forest, sprinkled with hemlock and white pine. In autumn, the deciduous trees lend the landscape red and gold hues that echo the rock of the canyon's famous Arizona namesake.
The scenery has not always been so visually pleasing. As demand for wood products grew in early 19th-century America, loggers moved into the area, where white pine and hemlock several feet in diameter and towering hardwoods populated the slopes. The pines were especially valued for making ship masts, and hemlock bark was used to tan leather. Before railroads arrived, logs were floated down Pine Creek to the Susquehanna in massive drives. By the early 20th century, decades of logging had left the land so barren that the area earned the moniker the Pennsylvania Desert.
The forest has since returned, and with it wildlife such as black bears, coyotes, bobcats, timber rattlesnakes, and a diversity of songbirds. In 1968, an area of 30,000 acres (12,000 hectares) was designated a National Natural Landmark.
Visitors can experience the gorge's natural splendor from multiple state parks and from the Pine Creek Rail Trail, which follows its path. The imagery was produced by Michala Garrison for NASA Earth Observatory using Landsat data from the U.S. Geological Survey, with an accompanying story by Lindsey Doermann.