Aaron Witt on Instagram: "The Hoover Dam Bypass Bridge, finished in 2010, is a remarkable feat of engineering. — While potentially the most boring bridge in the West to drive across (nothing but a concrete barrier to your left and right), its construction was anything but. — Designed as a concrete arch, crews built the structure from the Arizona and Nevada sides, with each growing piece of the arch supported by temporary cables and towers. — Once they met in the middle in 2009, the arch could su