US 89A crosses the Colorado River on Navajo Bridge, open 1995, built right next to an older bridge, now for pedestrians only. The river is 400 feet below the rim, flowing through a sheer-walled gorge, 500 feet wide at the top - this is the upper part of Marble Canyon, the northernmost section of the Grand Canyon.
A more unusual view of the bridge is from the end of a short, unnamed, east-side tributary canyon just south of the highway. The lower end falls away steeply, preventing any access to the waters edge, but the hike to a bench overlooking the Colorado is a pleasant one hour round trip.