The Stone arch is a pedestrian bridge with a walking path on each side of the bridge, and a biking path to separate them in the center.
The Mill City Ruins Park has walking trails along the river and is another great option if taking a stroll on the Stone Arch bridge is too busy when you arrive.
We have biked to the bridge many times by taking the River Road down from Minnehaha Falls. It is a gorgeous ride with beautiful houses on one side and the river on the other. It is mostly down hill on the way there so remember you will have to conquer that hill on the way back 🥵.