The longest of these, that crosses the Charles, has a span of 137 feet (42 m), and is a segmented arch with a radius of 69 feet (21 m) and a crown of 51 feet (16 m). Five of the arches span 37 feet (11 m), while that spanning Ellis Street is 28 feet (8.5 m). At its crown the bridge is approximately 70 feet (21 m) above the river.