The main span of the causeway is a double steel tied arch structure, spanning 121m and weighing over 3000 tonnes. DLT were engaged by the steel fabricator/erector, Cleveland Bridge, to carry out all erection engineering for this project. The main span was fully assembled in a yard some 300 miles from the site and then transported by barge into final plan position between the piers. The complete deck was then lifted to final height using 8 No 500 tonne strand jacks and connected in the air to pre-assembled end sections.