The Infinity Bridge is a public pedestrian and cycle footbridge across the River Tees in the borough of Stockton-on-Tees in northern England.

[1][2] Built at a cost of £15 million[3][4] with funding from Stockton Borough Council, English Partnerships and its successor body the Homes and Communities Agency, One NorthEast, and the European Regional Development Fund[5] the bridge is a major part of the North Shore Redevelopment Project undertaken by Tees Valley Regeneration.

The brief was for a "prestigious" and "iconic" "landmark" footbridge at North Shore Stockton, to cross the River Tees, which is 125 metres (410 ft) wide at that point.

[10][11][12][13] The subsequent design was led by Expedition Engineering assisted by[14] Arup Materials, Balfour Beatty Regional Civil Engineering, Black and Veatch, Bridon, University of Cambridge, Cleveland Bridge UK,[15][16] Dorman Long Technology,[16] Flint & Neill,[17] Formfab, GCG, GERB, Imperial College,[18] RWDI, Spence Associates, Speirs & Major, Stainton, and William Cook.

[19] English Partnerships appointed Flint & Neill Limited to carry out a Category III independent check of the bridge design, including loading, wind tunnel testing, and investigation of failure modes.

It has a pair of continuous, differently-sized structural steel arches with suspended precast concrete decking[2][4][9] and one asymmetrically placed river pier.

[10] The aggregate concrete deck sections are 7.5 m long[10] and down to 125 mm thick in places, making it one of the thinnest bridge walking surfaces.

[31][32] To ensure any bridge oscillation is controlled, the deck is fitted to the underside with seven tuned mass dampers – one on the short arch, and six on the larger[9] weighing 5 tonnes in all.

[10] The clearance (heading) below the decking on the navigable part of the river is 8 m.[25] A special feature is made of the way the bridge is lit at night.

At night the bridge handrail and footway are lit with custom-made blue-and-white LED lighting built into the handrail that changes colour as pedestrians cross the bridge; sensors trigger a change from blue to white, leaving a 'comet's trail' in the person's wake.

[20][22][35] The final section of the main arch came in four pieces which were welded together on site[10] and on 5 September 2008 all 170 tonnes of it was lifted into place by a 1,500-tonne mobile crane, the largest in the country.

The concrete deck panels were cast on site using three steel moulds in temporary sheds in a construction compound on the north bank of the river.

[10] Using a short temporary jetty on the north bank the deck, panels were floated out on a small barge and jacked into position,[3] working progressively away from the river pier.

[39] Foot traffic is anticipated to rise to some four thousand people a day as the North Shore site develops.