Plaka Bridge is a 19th-century stone one-arch bridge in Greece that collapsed during the floods of 1 February 2015.
It is located at the borders of Arta and Ioannina prefectures, above the waters of Arachthos River. Administratively, it belongs to the community of Plaka-Raftaneon. With its arch of 40 metres (130 ft) width and 17.61 m (57 ft 9 in) height, it was the largest one-arch bridge in Greece and the Balkans, and the third largest one-arch stone bridge in Europe. It also had two small auxiliary arches of 6 metres (20 ft) width on its two sides. It was considered "one of the most difficult, single-arch bridges to construct."
The bridge was the starting point for rafting and canoeing on Arachthos River.The bridge was built upon the order of Ottoman Sultan Abdülaziz, and was completed in 1866 under the supervision of the famous local builder Kostas Bekas from the nearby village Pramanta.