The Bridge over the river Vorma – Sundbrua

Work on the Sundbrua began at New Year's time in 1922, and it was opened to traffic on 15 December 1923.

The bridges were cut and built up by hand from stone from the hill above Tynsåk, approx. 3 km. from the river. The bridge is symmetrically divided, with spans of 60, 70 and 60 m in length. The total length is approx. 200 m, approx. 100 m shorter than the previous wooden bridge.

 At the start of the Second World War, on 12 April 1945, the bridge was blown up to delay the German advance. It was repaired again during the war years, first temporarily with wood on 23 July 1940, later permanently. There was also a bridge here before this Sundbrua. This was a pile bridge, built of wood. It was opened for traffic on 17 May 1857, three years after the railway came to Eidsvoll. In the 1860s, a "tilting span" was inserted on the west side of the bridge, so that boats could pass.

The very oldest possibility to get across the Vorma was to be rowed across by a "sundmann"   Being a riverman could be a challenging job, because sometimes the wind was so strong that it was too risky to set out, and other times there was so much timber in the river that it was difficult to get across. In winter, there was often an open channel in the middle of the river, while along the shores there was thick ice where channels had to be cut for the boat. The first sundman whose name is known in the Sound was Kristoffer Sundmann in the 16th century.

 The name Vorma means "the warm one". The water in the river of Vorma is so warm that it rarely freezes completely in winter.