If you take the suspension bridge underneath the Lee bridge, then it's quickly upcoming on your right. If you're going from Manchester, then take the 22nd (ish) St to go down that spiral staircase right across from that big apartment building, go right to follow the train tracks to the truss bridge, follow the path to where you're parallel/almost underneath belvedere and keep going and it'll eventually be on your left. On the way to "first break rapids."