(A19) Tees Viaduct from Maze Park's viewing hill
|Crosses||River Tees, Teesdale Way, Thornaby Middlesbrough railway line, B6541 and A66 roads and Lustrum Beck|
|Locale||Middlesbrough, England, UK|
|Official name||A19 Tees Viaduct|
|Maintained by||Autolink Concessionaires (A19) Limited (1997-2027)|
|Preceded by||Tees Barrage|
|Followed by||Tees Newport Bridge|
|Design||Slab and Girder|
|Material||Steel plate girders and composite concrete deck on reinforced concrete piers|
|Total length||2.9 km, spanning 1.95 km|
|Longest span||117 metres (384 ft)|
|Number of spans||68|
|Piers in water||none|
|Daily traffic||70,000 vehicles per day|
The A19 Tees Viaduct or Tees Flyover is a six-lane dual carriageway road bridge in the North East of England carrying the main A19 trunk road north-south across the River Tees. It is situated between Middlesbrough and borough of Stockton-on-Tees just north of the A19's interchange with the A66 trunk road. The Teesdale Way long-distance footpath, the Tees Valley Line, the B6541 (Old A66/A67, Stockton Road) and the A66 pass under the bridge on the southern bank of the Tees.
The viaduct is a beam or girder bridge. It has reinforced concrete piers and pier bends supporting steel-plate girder beams and a composite deck with some 200 moving parts. The viaduct is 2.9 km long and 1.95 km between abutments and was at the time the largest such bridge in the British Isles. It has 68 spans on the main north south route—the largest span being that over the river at 117 m.
The bridge was designed with sufficient clearance to allow ships to pass, although the port of Stockton-on-Tees up-river was virtually redundant by then. Since the Tees Newport Bridge had its lifting deck permanently fixed in the down position in 1990, large shipping can no longer reach the Tees viaduct, further reducing the need for such a high structure.
The bridge has had problems with corrosion since the it was opened and repairs have been necessary at times. Expansion joints cracked allowing de-icing salts to wash from the bridge carriageway into the piers, cross beams and columns giving rise to extensive chloride attack. It was then decided the best solution was the complete demolition and reconstruction of most of the piers and repair of others. From 1988 the underside of the bridge deck was enclosed with a steel and GRP panelling structure to protect the primary structure from the effects of weather and to allow safe and easy inspection and maintenance.
The bridge now carries some 70,000 vehicles a day and there are concerns that the capacity of the road is being exceeded at peak times Because of this CCTV cameras were installed on the bridge to record incident related congestion and respond more quickly. A detailed principal inspection report in 2006 concluded that the Tees Viaduct overall is in fair condition.
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