The World’s Largest Glacial Pothole Is Right Here In NEPA at Archbald Pothole State Park
A one-of-a-kind natural wonder can be found right here in Lackawanna County. Archbald Pothole State Park, a small but alluring 150-acre park in Archbald, is home to hiking trails, woodlands and scenic overlooks—but its real claim to fame is a rare geological marvel that draws visitors from near and far. Open from the second Friday in April until the third Saturday in November, this quiet park offers a chance to explore nature and witness one of Pennsylvania’s most fascinating natural features.
At the heart of the park lies the Archbald Pothole, one of Pennsylvania’s most unique geological formations. Formed by glacial meltwater over 15,000 years ago, this massive rock formation measures nearly 40 feet deep and over 40 feet wide. Deemed the world’s largest glacial pothole by the World Record Academy, it’s believed to have formed beneath a glacier as rushing water and debris carved into the bedrock.
The pothole was discovered in 1884 when coal miners blasted through a mine shaft and uncovered a vertical tunnel filled with 1,000 tons of rounded stones. Once cleared, the true scale of the formation was revealed.
Today, visitors can view this natural wonder from a fenced observation deck that extends over the rim. With a volume of 18,600 cubic feet—enough to hold 140,000 gallons of water—it’s a striking reminder of the region’s glacial past.
NEPA’s natural beauty meets industrial heritage on the small loop trail. The flat surface trail is less than one mile and begins on the wayside of the park. It follows the picturesque route of a former coal mine tram road which leads you past jagged rock ledges and through a dense forest.
It’s a peaceful walk suitable for all ages and skill levels, with opportunities to spot wildlife. Blue jays, red winged blackbirds and American robin are often spotted in the park. Also, be on the lookout for wildlife like white-tailed deer, turkey, squirrels and chipmunks.
Hunting is permitted in designated areas of Archbald Pothole State Park, offering opportunities for game such as deer, turkey and small mammals. Trapping is also permitted in accordance with state rules. Visitors should note that hunting is prohibited near the Archbald Pothole itself and the surrounding developed areas of the park.
All hunting must follow Pennsylvania Game Commission regulations, and groundhog hunting is not permitted. Visitors are encouraged to wear blaze orange during hunting seasons for safety.
Nearby NEPA Geographic Wonders
After you’ve checked out the enchanting pothole and taken a walk through the park, hop in the car and find more beautiful things in NEPA. There are plenty of nearby attractions worth a visit.
Continue your tour of NEPA’s greatest geological features with a stop at Hickory Run State Park’s Boulder Field. It’s located just 60 miles south on I-476. Sixteen acres of red sandstone and quartz conglomerate boulders are a sight to behold. Walk across and explore the natural wonder created from the last glacial period 20,000 years ago.
From there, a short 30-minute drive east on I-80 leads you to the Tannersville Cranberry Bog. It’s the southernmost low altitude boreal bog on the eastern seaboard. And while it doesn’t have a massive pothole or giant boulders, it is home to a 150-acre wetland of carnivorous plants, rare orchids and other unique and endangered species of plants. There are two public access walking trails, but to experience the boardwalk trail through the bog, you’ll need to plan ahead. The bog is owned by the Nature Conservancy and can only be visited during scheduled hours.
If you’re looking for more hiking, biking, fishing and water activities, several nearby parks fit the bill. Blakely Borough Recreation Complex is just 12 minutes away on US-6 BUS. It’s a designated public access point to the Lackawanna River and has basketball and tennis courts, a playground and walking trails along the river. It serves as an extension of the Lackawanna River Heritage Trail and is a popular spot for a game of pickleball.
The 1,445-acre Lackawanna State Park is 15 minutes west of the pothole and includes 18 miles of hiking trails and 15 miles of multi-use trails for mountain biking and horseback riding. Or drop your kayak, canoe or boat in the water in the 170-acre Tobyhanna Lake at Tobyhanna State Park, located 40 minutes southwest.
Make It A Day Trip
Conservation Tip
By following these responsible outdoor ethics from our friends at DCNR, we can help keep Pennsylvania’s state parks and forests top-tier outdoor recreation destinations for generations to come.
Leave No Trace
- Plan Ahead and Prepare: Know regulations, prepare for weather and emergencies, travel in small groups, minimize waste, and use a map and compass instead of marking trails.
- Travel and Camp on Durable Surfaces: Stay on established trails, camp at least 200 feet from water, and avoid damaging pristine areas.
- Dispose of Waste Properly: Pack out all trash, use catholes for human waste, and wash dishes 200 feet from water sources with biodegradable soap.
- Leave What You Find: Preserve historical sites, avoid disturbing nature, and prevent the spread of invasive species.
- Minimize Campfire Impacts: Use stoves when possible, keep fires small, burn wood to ash, and fully extinguish campfires.
- Respect Wildlife: Observe from a distance, don’t feed animals, store food properly, and control pets to avoid disturbing wildlife.
- Be Considerate of Other Visitors: Respect others by keeping noise low, yielding on trails, and camping away from high-traffic areas.
Article updated from its original version published on 5/30/23.
