It extends from Harlem High School to the dam at Rock Cut State Park along Willow Creek. Mostly we just do some or all of the trail that is inside the park, but once we made the trek from the dam all the way to the school, and then home. I think outside of the park it is maintained by Harlem Township since it is mostly in a Harlem Township park. We have been on short segments inside the park many times.
It runs along Willow Creek the whole way and is only rarely more than 100 feet from the creek. There is plenty of access to the creek for Wilma to go play or get a drink. It is mostly shaded as the description mentions. There is a side path that you can take down to the bottom of the dam. Probably too steep for bikes though.
I linked to a couple of our more interesting walks on this trail that have some pictures. Most of the pictures seem to feature a beagle in the creek. She likes creeks and there are lots of places she can get to it along this path.
We went from the dam to Forest Hills road on this occassion.
This time we went the whole way from the dam to the school, and then walked home from the school.
The path gets a fair amount of use. Most of the time we have been on it there are plenty of joggers, walkers, and bikers on it. It is kind of the main drag between several trail systems within the park and the Perryville Path along the west edge of the park.
There are a few benches and trash cans along the way, but that is about it in the way of facilities, at least at Rock Cut. There are toilet facilities and water available inside the park, but nothing real close to this path. The closest water and toilet facility is about 200 yards south of the dam along the park road. The toilets are pit toilets and are open year round. They shut the water off once it gets cold. I do not recall if there is water and/or toilets at Johnson Park or not. There may be. I only went that way the one time and it was a while ago. I am pretty sure there is nothing but maybe a trash can and/or a bench on the segment between Perryville and Forest Hills Road.
There are no lights on the trail inside Rock Cut State Park, but I think there are at least some to the west. There may be lights that go all the way to Harlem High School, but we were on it during the day, so I don't recall for sure. I don't even know if the lights are turned on, since it was not dark when we went that way.
There is an underpass at Perryville Road as you head west out of Rock Cut State Park that makes it easy to get past this busy road. There is also an underpass at Forest Hills Road but it was flooded at least once when we were there, so we had to walk across the road. It is only a moderately busy road though.
One time when we were on this path a Loves Park PD car snuck up on us from behind. I have also seen a fair number of ducks on the creek.
Plenty of parking at the park by the dam and at the school. Just don't get locked in at the park, as they close promptly at 5pm during from November thru March. I don't recall if the school has gates they lock or not. I don't think so.