Mason-Dixon Trail: Lock 12 to E Posey Rd

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Airville, Pennsylvania

Mason-Dixon Trail: Lock 12 to E Posey Rd is a 9.4 mile heavily trafficked out and back trail located near Airville, Pennsylvania that features a lake and is rated as difficult. The trail is primarily used for hiking, running, nature trips, and bird watching and is best used from March until October. Dogs are also able to use this trail but must be kept on leash.

Distance: 9.4 miles Elevation Gain: 1,673 feet Route Type: Out & Back

dogs on leash

hiking

nature trips

bird watching

running

forest

lake

river

views

waterfall

wild flowers

wildlife

rocky

Following the blue-blazed trail, this hike begins at the historic Lock 12 of the Susquehanna Canal then heads south for a quick loop on Peavine Island. Access to Peavine Island is seasonable and a section of the trail can at times be under water. If this is the case, continue heading north on the blue-blazed trail back under the Norman Wood (blue) bridge along the Susquehanna River. The trail then turns left to River Road by an old saw mill. Cross over the bridge and take an immediate left to head up Mill Run. Enjoy the beautiful waterfall views surrounded by rhododendron with a gradual incline. When the trail begins to head right and you see a fork, take the right and use the switchbacks to climb up the trail towards the power lines. Great views of the Susquehanna River, the Norman Wood Bridge, Holtwood Hydroelectric Plant, and Lake Aldred along this stretch with two overlooks. The second part of the trail features no long views, but follows a couple of creeks through some pretty woods. Note that the only thing past the obvious campsite at the second stream crossing is a climb up an old road to a gate at a gravel road. There's no view and no obvious reason to go up there.

hiking
4 days ago

Great trail. Took us about 5:45 minutes at a leisurely pace with some stops.

hiking
muddy
off trail
rocky
scramble
5 days ago

Awesome hike! Will be back again!

hiking
13 days ago

This has become my new favorite trail. It’s absolutely gorgeous and definitely difficult at points. My only complaint is that some times it was hard to find the blue markings. Definitely doing this one again.

hiking
rocky
13 days ago

Good challenging trail runs along a creak with some small nice waterfalls. Easy to get to some the creaks. Lots of shade, busy but lots of parking. Some parts of trail are narrow but still passable with out brushing against poison leaves.

Super cool trail. Newer hikers could do it; however it is a bit more aggressive than other trails in the area. Got there about 9am and was able to “avoid” the crowds I saw at 12.

hiking
over grown
rocky
15 days ago

The best trail so far. Challenging and beautiful. Numerous water falls. Will be back!

hiking
rocky
20 days ago

hiking
rocky
22 days ago

This is becoming a top 5 favorite place (for me) to hike in PA. It’s rocky, has waterfalls, elevation, a major river, a dam and islands to walk to, plus a large bridge serves as the backdrop. When the river is overflowing, it’s hypnotic to listen and watch. Once the river receded, the dog and I were able to use the trail to walk over to Peavine island. I recommend doing both sides of the trail (Peavine Island and Lock 12 side) and going to Posey Rd. The beautiful cascades and trail views are worth it and if you enjoy the countryside, hike back via Posey and Blain Roads to McCall’s Ferry. It’s beautiful. Between the trail to Peavine, the cascade trail across from the dam and the hike up to Posey Rd and back around, it’s a total of 15 miles.

hiking
muddy
rocky
scramble
1 month ago

hiking
rocky
scramble
1 month ago

I did over 10 miles and let me tell you, it’s rough going. I jogged some areas but certain sections are pretty rocky. Definitely a challenging trail but worth the effort!

1 month ago

Fun hike, great views. Loved hiking up the creek as well.

hiking
1 month ago

I was tempted to give this 4 stars, because the last 3/4 mile hike up to posey road is pretty boring and doesn't need to be hiked up to. The rest of the trail was great, with almost constant creek, waterfall, or river views. This was one of my favorite hikes so far on a well maintained, and well marked trail. There was a lot of change in terrain with some fairly steep incline and declines.

1 month ago

I enjoy this well marked, relaxing path. It does have some steep areas but my daughter's been able to do this trail since she's two. The whole family really enjoys it. My daughter is now 7. When she was younger we did take picnic breaks but now that my children are a little older we just keep going and snack along the way if we need one. Newbies give yourself plenty of time.

1 month ago

would be an excellent trail if it wasnt filled with garbage, graffiti, and human sign.

hiking
1 month ago

Thoroughly enjoyed the variety of paths and the amount of water. Lovely path along the river and then a nice path criss-crossing up to the lookout. The waterfalls were very picturesque. The blue trail is very well marked.

hiking
rocky
2 months ago

We hiked about 12 miles in total along the blue trail. Well marked and easy to follow. Beautiful waterfalls in the beginning.

hiking
2 months ago

Very well marked trail!

hiking
2 months ago

Starts off along the historic canal with rock outcroppings into the river and a great view of the bridge and dam. Then moved into flat forest before headed up a stream valley with small waterfalls, up for a great view over the region, then a power line, then a long way along the peaceful river to another valley, where you go up and into a mossy dark beautiful stream. Out and back. Stay along the blue trail the whole time, super easy to follow. Interesting man-made features and great forests with well-earned gorgeous spots. Some steep ups and downs, but really pleasant and not overwhelming. I had fun

Steep and thin trail at times, some rocky parts, beautiful waterfall on the way up.

hiking
muddy
rocky
2 months ago

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