Arch bridges are one of the oldest types of bridges and have great natural strength. Instead of pushing straight down, the weight of an arch bridge is carried outward along the curve of the arch ...

In filmmaker Sonya Stefans hometown of Sault Ste Marie Ontario a truss arch bridge straddles the St Marys River linking Canada to the United States But underneath the bridge a kind of liminal ...

Creeper Derricks were used to build the arch - slowly going up the sides as it increased in height. Then the Stabilizing Truss was installed to brace the sides of the arch. The last piece is the ...