The Fall Run Trail in Glenshaw, Pennsylvania, is an easy 1.6 mile out-and-back hike with a 15 foot waterfall in the middle of the hike - Fall Run Falls. It's a short hike and runs along Fall Run Creek the entire time with scenic views along the creek of the ravine/gorge that you hike through. There's another waterfall closer to the southern end of the trail, just after you cross the creek the 2nd time - this waterfall is about 5 feet tall and about 5 to 8 feet wide. There's no outcropping overlook for the smaller waterfall, but you can get a glimpse of it right on the side of the trail.
Along the sides of the ravine are seasonal creeks with waterfalls that cascade down into Fall Run Creek during the Spring and wetter months. Most of these additional waterfalls run down the hillside are multi-tiered, but there are a couple of 10 foot falls directly in Fall Run Creek as well. This is definitely one of the best hikes just outside of Pittsburgh, Pennsylvania and is a very unique spot in the winter.
For an additional adventure at Fall Run Park, check out the Hidden Waterfall Trail, which is a difficult hike, but has some two huge waterfalls during heavy-rain seasons.