The Clattern Bridge, dating from the 13th century, is the oldest working bridge in the county of Surrey. The bridge is also a Scheduled Ancient Monument with the name believed to be derived from the clattering of hooves as they crossed the bridge that spans the Hogsmill River, a tributary of the River Thames. A blue plaque is located on the north west side of the bridge with that side of the bridge being the oldest part, being only 8 feet wide until it was widened in the nineteenth century.