There’s music in water. Brooks babbling, fountains splashing. Weirs, waterfalls, tumbling, gushing.”
― Julie Andrews, actress and singer
July 21 & 24, 2025
Located in Lawrence County just outside of New Castle, Pennsylvania, the 2,546-acre McConnells Mill State Park surrounds the Slippery Rock Creek Gorge, a National Natural Landmark. The gorge was created by the draining of glacial lakes thousands of years ago and has steep sides with huge boulders.
Visitors can tour a historic gristmill and covered bridge that both date to the 1800s and get a close-up view of the powerful stream that continues to carve the valley. Popular activities are fishing, hiking on 9 miles of trails, whitewater boating, rock climbing, picnicking, and exploring the scenic overlooks, forests and waterfalls. The park is open from sunrise to sunset, year round.
We visited the Mill area and some waterfalls in the park on July 21, 2025 with our daughter and her family. Parking for the mill, covered bridge, and Kildoo Trail is recommended at the Kildoo Picnic Area and then using the stone stairs down to the mill. However, when we visited the stairs were closed for repair. Although we were able to park at the mill site, parking there is extremely limited and usually only available for handicapped parking. Visitors who couldn’t find parking had to walk the steep and narrow one-way road down from the Kildoo Picnic area to access the mill and covered bridge.
McConnells Mill & Covered Bridge
Our first stop was to see McConnell’s Mill, which sits between the park’s covered bridge and a dam. Unfortunately, the historic and picturesque gristmill wasn’t open on that day. However, it is open Memorial Day through late September on Wednesdays through Sundays from 10:30 AM to 3:30 PM. Interpretive tours of the mill are available at 1:00 and 2:00 PM. We planned to stop back on a day when it would be open.
 | | McConnells Mill and Dam |
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 | | Garden at McConnells Mill |
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The McConnell’s Mill covered bridge, which spans Slippery Rock Creek, is one of two remaining covered bridges in Lawrence County. It was built in 1874 and is a National Historic Landmark.
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 | | McConnells Mill Covered Bridge |
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 | | McConnells Mill Covered Bridge |
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Kildoo Falls
Kildoo Falls is located under Kildoo Bridge near the historic mill and covered bridge. To see it, we had to hike a short distance on the Kildoo Trail. The trail is mostly easy to hike, but has some rocky areas leading to the falls. The falls generally have a thin stream or two of water flowing off a cliff with a small area behind the falls. These falls are best viewed after a heavy rain, but we did see some water trickling down the rocks.Alpha Falls
After returning to our truck, we drove to the trailhead for Alpha Falls. Alpha Falls is the tallest waterfall in McConnells Mill State Park, but it flows only seasonally and it’s best seen after a recent rain. Fortunately for us, the falls were running during our visit.
 | | View along the trail to Alpha Falls |
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 | | Alpha Falls |
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To get to the falls from the parking area, we took the Alpha Pass Trail along a set of switchbacks and steps to the bottom of a rock wall. After a short distance, the trail opens at the bottom of a cliff. From there we followed the trail to the right along the cliff where there was an obvious but unmarked trail. Less than 100 yards later we arrived at the base of falls.
After viewing the falls we returned to our truck for the next site on our list.
Hells Hollow Falls
Hells Hollow Falls is located on the western edge of McConnell's Mill State Park, and is the most popular waterfall in the park. At only 15-feet-tall, it isn’t the tallest waterfall in the area, but it’s quite scenic and easy to reach from the parking area. The half-mile trail to the falls is relatively flat, taking you along a stream that has carved a small gorge into the ground. The trail leads to a staircase taking you down to the base of the falls. Visitors should be careful on the stones at the base of the falls because they get quite wet and slippery. If the falls are flowing well, it could be hard to get a good view of the falls. We had to get our feet a little wet to get that front view of the falls from the bottom, but a nice side view can also be had from the stairs. There were a lot of people at these falls and we had to wait our turn to take our photos before heading back on the trail to our truck.
 | | View along the trail to Hells Hollow Falls |
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 | | Hells Hollow Falls |
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 | | Hells Hollow Falls |
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And where did the name "Hells Hollow" come from? Legend has it that the valley got its name from a military officer who got lost in the valley at night. Upon seeing the distantly glowing fires from limekilns that dotted the valley at that time, he thought he had wandered as far as the gates of hell!
Breakneck Falls
Our last stop of the day was to see Breakneck Falls. The falls are located south of the McConnells Mill Covered Bridge. Although you can hike to the falls by taking either the Kildoo or Slippery Rock Gorge trails, we drove to a parking area on a dirt road above the falls, then walked down the road to Eckert Bridge. There’s also limited parking at the bridge, but we didn’t want to chance that it would be full.
Breakneck Trail begins on the left as you come down the hill to the bridge crossing Slippery Rock Creek. We walked out on the bridge first to get some views of the creek before starting our hike to the falls.
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View of Slippery Rock Creek from Eckert Bridge |
The hike to the falls is only about a quarter of a mile downstream. The trail is relatively level, although there were some large rocks and boulders that we had to make our way over and around. When the trail reached Cheeseman Run, we could hear the falls as we hiked up about 100 feet through massive boulders until we reached the falls.
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| Breakneck Falls |
Breakneck Falls is a 25-foot multi-tiered waterfall below a bridge and has towering rock walls surrounding it. The falls got its name from the steep, slippery rocks it flows over as it makes its way to the Slippery Rock Creek below. As with some of the other falls in the park, they are best seen after a hard rain. However, they were running fairly well during our visit.
That brought to an end our day in the park, but not an end to visiting the park. On July 24 we returned to the mill because it was open. We spent some time exploring it and looking at the things on display. We also asked one of the park rangers about the mill stones we had seen when we hiked part of the Kildoo Trail earlier in the week to see the waterfall. They told us the millstones were NOT from McConnells Mill, as we initially assumed, but from another mill that was once located in the area where we saw the stones. The millstones are the only remnants from that mill that we saw.
Kildoo & Slippery Rock Gorge Trails
After finishing our tour of the mill, we returned to the Kildoo Trail so we could hike the entire trail. In addition to revisiting Kildoo Falls, we saw quite a few other small waterfalls as we made our way along to the trail’s end. After crossing over the bridge near Breakneck Falls, we followed the Slippery Rock Gorge Trail back to the covered bridge and McConnells Mill. The Slippery Rock Gorge became a National Natural Landmark in 1974 and a State Park Natural area in 1998. The gorge has steep sides, a lot of rocky outcrops, and some seasonal waterfalls.
We had a wonderful time visiting McConnells Mill State Park and hope to return one day so we can explore more of the park's features. If you'd like to view a video showing highlights of our visit to the park, click here.
* All photos and videos are the property of the blog owners unless otherwise noted. *