Hoberman Park Parking Lot (East)
Parking lot
225 E Park St, Lock Haven, PA 17745
Creek PA
Hammersley Hole
By Hidden Swimming Holes Team - Last reviewed 2025
A guide to Hammersley Hole, a remote Pennsylvania swimming hole. Details on the challenging 12+ mile hike, safety tips, and directions for experienced adventurers.
Water type
Creek
Access
Official
Fee
Free
Best season
Late May to early September for optimal weather and warmer water temperatures. Autumn offers striking foliage for photography enthusiasts
Nearby towns
Williamsport, Lock Haven, Renovo
Water body
Hammersley Fork
Location
Map & Directions
Nearby towns
Williamsport, Lock Haven, Renovo
Map pin
RENOVO, PA
Approximate location based on the nearest town — confirm the exact spot and access before you go.
About Hammersley Hole
Hammersley Hole is not a place you stumble upon. It is a place you earn. Tucked deep within a remote stretch of Pennsylvania state forest along Hammersley Fork, this unofficial natural swimming pool rewards only those willing to push through a strenuous 12-mile round-trip hike on narrow, steep trails that wind through some of the wildest terrain in the Keystone State. If you are an experienced hiker with solid map skills and a hunger for genuine solitude, this is one of Pennsylvania's most extraordinary destinations.
The Setting and Landscape
The trail to Hammersley Hole immerses you in a living, breathing wilderness long before you reach the water. Dense forest canopy filters the light into shifting green patterns on the trail floor. The air smells of damp earth, moss, and cold creek water. Along the way, you cross two cable bridges and a private swinging bridge — each crossing a small adventure in itself, the cables humming faintly under your weight as the water rushes below. The creek corridor is rich with biodiversity: listen for the calls of woodland birds and watch for wildlife along the banks. In autumn, the surrounding hillsides erupt in amber, crimson, and gold, making the hike itself as spectacular as the destination.
The Swimming Experience
When you finally arrive, Hammersley Hole opens before you as a secluded natural pool carved by the cold, clear waters of Hammersley Fork. The water is clear, with varying depths that invite both cautious waders and confident swimmers. On a warm summer afternoon, slipping into that pool after miles of steep trail feels like the most well-deserved reward imaginable — the cold shock of the water giving way to a deep, full-body relief. Because there are no facilities of any kind here, the experience is purely elemental: you, the water, the forest, and the sound of the creek finding its way downstream. This is a true wilderness swim, unspoiled and unhurried.
Plan Your Visit
Hammersley Hole is best visited from late May through early September, when weather conditions are favorable and water temperatures are most comfortable for swimming. Autumn visits offer spectacular foliage photography, though swimming may be cold. This site is unofficial, carries no fee, and has absolutely no facilities on site — pack in everything you need, including water, food, a first aid kit, and navigation tools. A paper map and compass are strongly recommended alongside any digital navigation. Nearby camping is available at Ole Bull State Park, making a multi-day trip a natural choice for those who want to explore the area fully. The nearest towns for supplies and lodging are Williamsport and Lock Haven, both within reasonable driving distance. The small community of Renovo also sits close to the region and serves as a useful access point for the surrounding forest. Plan ahead, leave no trace, and respect the remote character that makes Hammersley Hole so special.
Getting There
Directions to Hammersley Hole, PA
Hammersley Hole is a remote swimming hole located in Pennsylvania. The hike to reach it is challenging and requires good map-reading skills. Please ensure you are prepared for a strenuous hike and take necessary precautions for wildlife, including rattlesnakes. A trail map is highly recommended.
Driving Directions:
From Williamsport: - Begin by heading west on Route 220 for approximately 25 miles to reach Lock Haven.
From Lock Haven: - Take Route 120 northwest for about 30 miles. Continue past the town of Redovo until you reach Route 144.
On Route 144: - Turn north onto Route 144 and drive through Tamarack. Continue until Route 144 reaches a "T" intersection and turns right. At this intersection, set your odometer.
Continue on Route 144: - Turn right at the "T" intersection and drive approximately 1.75 miles. Look for a dirt road on your left (north) marked "Hammersley Fork Ave." Note: This turn is about 4.75 miles before you reach Cross Fork on Route 144.
Trailhead and Hiking Directions:
Dirt Road Access: - Turn onto Hammersley Fork Ave, which is a dirt road. There are two entrances to this road; only the northern entrance is open. The southern entrance crosses a small bridge marked "closed." Proceed north on the dirt road for about half a mile. This section of the road parallels Hammersley Fork Run and passes through private land before entering State Forest land.
Stream Crossing: - The dirt road fords the stream and is closed to vehicles. You can cross the stream via a two-cable footbridge or by foot. Once across, follow the road on the west side of the stream for approximately one mile.
Bridge Crossings: - As you hike, you will encounter a private swinging bridge and another cable bridge. These allow you to cross back to the east side of the creek. Follow the stream north until you reach County Line Run.
Finding the Footpath: - Look carefully along the base of the mountain for a narrow footpath that ascends a grade and runs parallel to Hammersley Fork along the mountainside. The footpath levels off before descending to Dump Hollow. If you miss the footpath earlier, you can connect with it here.
Continuing the Hike: - Follow the path through Dump Hollow and continue onward. The trail will lead you to Elkhorn Hollow. Stay on the path as it descends to stream level. After a short distance, you will arrive at Hammersley Pool.
Important Notes: - Hike Length: The round-trip hike is over 12 miles and traverses demanding terrain. The mountainside trail is narrow, with steep slopes. Only experienced hikers should attempt this route. - Wildlife Warning: Rattlesnakes have been spotted in the area. Exercise caution and remain alert. - Trail Navigation: The footpaths are not well-marked, and Hammersley Fork branches into multiple tributaries upstream. A detailed trail map is essential for navigation. - Parking: Park near the entrance to the dirt road (Hammersley Fork Ave). Ensure your vehicle is not blocking access to private property or the road.
Enjoy your hike and stay safe!
Quick Navigation
Access Notes
Access is via an unofficial, unmaintained route on state forest land. The hike is long and strenuous, with unmarked trails. The southern entrance to Hammersley Fork Ave is closed; use the northern entrance. Parking is limited to the roadside near the dirt road entrance without blocking access.
Plan Your Visit
Parking & Access
Parking is typically available near the main access point; arrive early on weekends and avoid blocking gates or driveways. The approach follows established paths - expect uneven terrain and occasional slick rock near the waterline.
Regulations & Fees
No fee is commonly reported, but policies change - verify current access rules and hours before you go. This location is commonly accessed via public lands or established easements; stay on designated routes and follow posted rules.
Seasonality & Flow
Water levels and clarity shift with season and recent weather. After storms or snowmelt, expect stronger currents and colder water - choose calm pockets and wade carefully.
What to Bring
Bring sturdy water shoes to protect your feet on rocks and slippery surfaces. A waterproof dry bag keeps your phone, keys, and valuables safe. Pack a quick-dry towel, sun protection, and drinking water - never drink from the natural water source.
Nearby Facilities
Public map data to help plan parking, services, and backup options before you drive.
Checked 2026-06-15
Taggart Park Parking Lot
Parking lot
1 (1)
12 Myrtle St, Lock Haven, PA 17745
Hoberman Park Parking Lot (West)
Parking lot
219 Logan St, Lock Haven, PA 17745
Zindel Park
Hiking area
4.9 (62)
Reservoir Rd, Lock Haven, PA 17745
Lost Acres Camping Resort/Eatery
Campground
4.8 (120)
15235 Coudersport Pike, Lock Haven, PA 17745
North 40 Campground
Campground
4.3 (26)
Lock Haven, PA 17745
Restroom
Haneyville Campground
Campground
4.3 (15)
204 Millers Ln, Lock Haven, PA 17745
Public restroomRestroomTent sites
Restroom
Public bathroom
4.3 (3)
E Launch Rd, Howard, PA 16841
Live Conditions Nearby
Checking nearby USGS water conditions…
Frequently Asked Questions About Hammersley Hole
Is Hammersley Hole free to visit?
Hammersley Hole is generally free to access. No entry fee is commonly reported, though parking passes or day-use fees can be introduced - always confirm current rules before heading out.
Is swimming allowed at Hammersley Hole?
Yes, Hammersley Hole is an officially sanctioned recreation area where swimming is permitted. Reported activities include: Hiking, Swimming. Always respect posted closures and seasonal restrictions.
What type of swimming spot is Hammersley Hole?
Hammersley Hole is a creek on Hammersley Fork located in Pennsylvania, near Williamsport. A guide to Hammersley Hole, a remote Pennsylvania swimming hole. Details on the challenging 12+ mile hike, safety tips, and directions for experienced adventurers.
When is the best time to visit Hammersley Hole?
The best time to visit Hammersley Hole is Late May to early September for optimal weather and warmer water temperatures. Autumn offers striking foliage for photography enthusiasts. Water levels, clarity, and temperature vary with recent weather - always check conditions before going, especially after rain or snowmelt.
What facilities are available at Hammersley Hole?
Reported facilities at Hammersley Hole include: No facilities at Hammersley Hole. Camping and amenities available at nearby Ole Bull State Park, including restrooms and picnic areas. Amenities can change - contact the managing agency or check recent visitor reports to confirm current availability.
Is camping available near Hammersley Hole?
Nearby at Ole Bull S.P.
Highlights
Secluded natural pool in Pennsylvania
Challenging 12-mile hike to access
Clear water with varying depths
Rich biodiversity and scenic views
Ideal for adventurous hikers and swimmers
Unique Features
Remote location accessed via a challenging hike
Unspoiled natural beauty and vibrant ecosystem
Two cable bridges and a private swinging bridge along the trail
Autumn foliage creates dramatic views
No facilities, emphasizing true wilderness experience
Location & Area Map
Safety Information
Important Safety Tips
- The round-trip hike is over 12 miles on demanding, unmarked trails; only attempt if experienced and prepared
- Carry a detailed topographic map and compass/GPS; the trail is not well-marked and the fork has multiple tributaries
- Rattlesnakes are present in the area; stay alert, watch your step, and give wildlife space
- Cell service is likely unreliable; inform someone of your plans and expected return time
- Be prepared for stream crossings; water levels can rise quickly after rain
- Bring all necessary water, food, first-aid, and emergency supplies as there are no facilities
Cultural & Historical Context
Historical Background
The area reflects Pennsylvania’s rich history of outdoor recreation and conservation. Nearby towns like Lock Haven and Williamsport offer historical landmarks and cultural events.
Photography Guide
Photo Opportunities
Best photography spots include the cable bridges, the emerald-green pool, and the forested trails. Visit during early morning or late afternoon for optimal lighting.
Conservation & Ethics
Protect This Place
Visitors should follow Leave No Trace principles. Pack out all trash and respect the fragile ecosystem to preserve its natural beauty.
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At a Glance
Best Time to Visit
Late May to early September for optimal weather and warmer water temperatures. Autumn offers striking foliage for photography enthusiasts.
Difficulty Level
Strenuous. Requires a 12-mile round-trip hike on narrow, steep trails. Suitable for experienced hikers with good map skills.
Fee
Free
Facilities
No facilities at Hammersley Hole. Camping and amenities available at nearby Ole Bull State Park, including restrooms and picnic areas.
Activities
Hiking, Swimming
Phone
Unknown
Safety & Access Notice
This information is for general planning only and may be incomplete, outdated, or inaccurate. Access rules, closures, water levels, currents, hazards, and legal restrictions can change at any time. Always verify current rules with the land manager or official source before visiting.
You are responsible for your own safety and for following all posted signs, laws, and local regulations. Read the full disclaimer.
Camping Information
Nearby at Ole Bull S.P.
Nearby Attractions
- Ole Bull State Park - State Park
- Kettle Creek State Park - State Park
- Lock Haven - Town
- Williamsport - Town
- Little League Baseball Museum - Historic Site
- Tiadaghton State Forest - State Forest
- Renovo - Town
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Safety & Access Notice
This information is for general planning only and may be incomplete, outdated, or inaccurate. Access rules, closures, water levels, currents, hazards, and legal restrictions can change at any time. Always verify current rules with the land manager or official source before visiting.
- Do not swim where swimming is prohibited, unsafe, or not clearly allowed.
- Follow posted signs, local regulations, closures, and private-property boundaries.
- Assess conditions on site. Water flow, depth, temperature, and underwater hazards change quickly.
- Never jump or dive without personally confirming depth and underwater obstacles.
- Swim with a buddy and consider flotation for weak or non-swimmers.
- Pack out all trash; respect wildlife and fragile environments.
You are responsible for your own safety and for following all posted signs, laws, and local regulations. Read the full disclaimer.
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Joshua Havens
Founder & Editor, Hidden Swimming Holes
Joshua Havens created Hidden Swimming Holes to make it easier for people to find — and safely visit — natural freshwater swimming destinations across the United States. He researches access conditions, water quality resources, and land management rules so you don't have to start from scratch. He holds a strong belief that good outdoor recreation information should be accurate, honest about its limitations, and freely available.
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