Once you pass the Upper Mad river road bridge the river calms down from continous class III to class II+. 1/4 mile from the bridge Smarts Brook enters on the left, NH route 49 will be visible straight ahead with a distinct drop before the road. Use a zig zag manuever starting from river right, move left, then river right once more around immense boulders. The turbulance in this section can be considerable in medium and high water.