The Steel Bridge may look unremarkable — especially compared to Portland's other river-spanning icons — but it's an engineering rarity. Why it matters: It's the only active telescoping vertical lift ...

The templates are steel truss frames, 60 feet (18.3 m) by 60 feet by 30 feet (9.2 m) high. There are four piles per template, each 72 inches (183 cm) in diameter and 427 feet (130.1 m) tall.

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The steel trusses holding up the roof will also be painted in a colour more reminiscent of the hydro's early 20th-Century heyday.

Until the George Washington, modern suspension bridges were stiffened with steel trusses and beams to limit motion in traffic and wind (an important consideration when a bridge's length is large ...

Adding a concrete deck Adding steel truss components Installing railing Installing decorative lights However, Harris emphasized how access is what he is most looking forward to.