The Sundial Bridge (also known as the Sundial Bridge at Turtle Bay) is a cantilever spar cable-stayed bridge for bicycles and pedestrians that spans the Sacramento River in Redding, California, United States and forms a large sundial. It was designed by Santiago Calatrava and completed in 2004 at a cost of US$23,500,000. The bridge has become iconic for Redding.
The pylon is 217 feet high - almost equal to 20 stories building.
The angle of the pylon is 42 degrees and points directly north.
The pylon is a gnomon for a giant sundial - it's markers are set for the Summer Solstice, June 21, when its shadow moves 1 foot per minute between 11am and 3pm.
There are 14 cables - 4,342 feet total length - that support the bridge.
The bridge is designed to flex, sway, expand and contract to absorb changes in the load.
Gravity keeps the bridge from falling down - the pylon and deck pull on one another through the cables.
To protect salmon spawning beds, no part of the bridge touches the
water except during season floods.