Halfpenny Bridge is a bridge across the River Thames, at Lechlade, Gloucestershire, England. It marks the start of the navigable Thames, although if the waters are high, the Thames can continue to be travelled by small and unpowered craft as far as Cricklade, over 10 miles South-west.The bow-backed bridge was built to a design of James Hollingworth in 1792. It carries the A361 from the south into Lechlade.