The steel bridge deck is mounted on two floatation tanks and was manufactured locally in Norwich, allowing it to be delivered as single completed unit. It was launched into the river at Hickling Broad using a 70 tonne crane, before being floated one mile upstream to its resting place at Martham.
Jackson has worked closely with the National Trust throughout the project to reduce the impact on both the local community and wildlife. The majority of the heavy construction work was carried out away from the river, and piling works were sequenced to coincide with the end of the holiday season and ahead of the arrival of over-wintering birds.
Paul Coleman, National Trust building surveyor, said: "Heigham Holmes is a wonderful nature reserve and part of its charm lies in its peaceful isolation, so ensuring the site had suitable and safe access was a big part of the challenge. Working with Jackson, we have achieved this, and managed to preserve the identity of this unique place."