How The Roman Army Bridged The North Tyne At Chesters

How to build a mortared structure in a stony river bed 
1. Dig a diversion Channel

2 Dam the river at both ends & Divert the river
3 Constructed mortared stone peers in river bed
4 Construct bridge
5 Remove Dams
6 Block diversion channel

Notes

• 1 The initial Bridge was intended to carry the Wall only.
• 2 In theory, second [undetected] Bridge would have carried the Road south of the Wall. this road is evidenced by its construction trench aka The Vallum.
• 3 [This itself was have replaced another lost bridge for the Staingate road, although piled timber would be adequate for road bridges].  
• 4 This first phase of road, like most of the early “Broad Wall”  was never completed
• 5 Subsequently, a second wider bridge was constructed to carry the Wall & a roadway now represented by the Military Way towards the end of the century.
  

The Diversion Channel encloses an area almost a large as the fort at Chesters on the opposite bank, one of the original forts presumably designed by Hadrian, who would have almost certainly got involved with bridge design.

Standard Disclaimer; Not Available at University

Academics just don’t think about these problems, and are content with reproducing of the ideas previous generations. Thus, as an evidence based form of archaeology using science and engineering  proved incompatible with the faith based archaeology currently practiced at many Russell Brand Universities like Newcastle, the last bastions of Science denial.