A435 Evesham By Pass – Simon de Montfort Bridge


Balfour Beatty Construction Ltd for Department of Transport

Project Description

This river crossing was delivered as a steel & concrete composite alternative design to the pre-stressed concrete box girder design offered by the Client for tender. Three continuous skewed spans carry the by-pass over the River Avon and, construction in steel with lighter foundations proved a more economic solution. The aesthetics and span arrangement had been established demanding a curved soffit profile for good appearance, a shallow depth at mid-river to clear the navigation and intermediate piers located at the river banks. The steelwork design for the 15.2m wide deck was novel (at the time) using widely-spaced twin main plate girders and cross girders and represented the first of the, now popular, contemporary “ladder” bridges to be constructed in the UK

Cass Hayward Role(s)

  • Design for tender
  • Detailed design of superstructure, substructure and foundations
  • Temporary works design and checking

Project Statistics

  • Completed December 1986
  • Bridge cost £820,000, saving £124,000
  • Continuous spans – 28m, 42, 28m skewed at 17 degrees
  • Steel girders vary in depth with curved profile from 1.23m to 2.33m

Special Features

  • Alternative design subjected to scrutiny by Royal Fine Arts Commission
  • Alternative design encouraged by mitigation of the risk arising from soft ground and flooding during construction of RC deck.
  • Spread foundations constructed on Lias clay


  • Structural Steel Design Awards 1988 - Commendation