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The Sundial Bridge is a cantilever spar cable-stayed bridge for bicycles and pedestrians that spans...

The Sundial Bridge is a cantilever spar cable-stayed bridge for bicycles and pedestrians that spans the Sacramento River in Redding, California, United States and forms the world's largest sundial. It was designed by Santiago Calatrava and completed in 2004 at a cost of US$23,500,000. The Sundial Bridge provides pedestrian access to the north and south areas of Turtle Bay Exploration Park, a complex containing environmental, art and history museums and the McConnell Arboretum and Gardens, and it forms the gateway to the ten-mile-long Sacramento River Trail. Drift boats of fishermen are often seen passing beneath the bridge as they fish for salmon, steelhead and rainbow trout. In the distance, Mount Shasta is barely visible. The support tower of the bridge forms a single 217 foot (66 metre) mast that points due north at a cantilevered angle, allowing it to serve as the gnomon of the world's largest sundial. The gnomon's shadow is cast upon a large dial to the north of the bridge, although the shadow cast by the bridge is exactly accurate on only one day in a year – the summer solstice, June 21. The tip of the shadow moves at approximately one foot per minute so that the Earth's