It's a 1.8 loop around the reservoir, but that did not include the long incline you need to walk to get there.
If you walk the pavement up the hill and don't take the grassy shortcuts turning left will get you a 2.0 mile walk, If you take the path straight or to the right it's a 2.2 mile walk.
There are lots of benches on the way up and on the top, and don't forget the suntan lotion on the sunny days.
This is my favorite walking trail, because the water reminds me of my boating days as a kid, and the view of Newark especially when the train goes through the town of Newark it reminds me of a train model store but in real life, because you are so high above the city.
Go you won't be disappointed!