The Harrström stone bridge (known as Åback Bridge until 1983) is a stone museum bridge located in the village of Harrström in Korsnäs. The bridge was completed in 1898. It is a beam bridge constructed from granite blocks. The bridge has three spans and crosses the small river Harvungån. In 1982, the bridge was designated as a museum bridge.

The Harrström bridge is built using the so-called dry-stone technique. The rectangular hewn stones are fitted together without mortar. The bridge has no metal clamps or other structural elements binding the stones together. The length of the bridge deck is 14.6 metres and its total length is 26.4 metres. Its usable width is 4.7 metres and its total width is 5.7 metres. The largest opening of the bridge is 3.7 metres, its longest span is 4 metres, and the clearance under the bridge is 1.5 metres.

The bridge site is part of the historic Ostrobothnian coastal road. In 1983, a new Åback Bridge was built next to the old stone bridge, after which the old bridge received its current name and became a pedestrian and bicycle bridge.