Hoover Dam Spillway Tunnel

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One of two spillway tunnels at Hoover Dam on the Arizona/Nevada border

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Inside hoover dam (tunnel)

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-Hoover Dam, Arizona tunnel spillway -misalignment that caused major

One of two spillway tunnels at Hoover Dam on the Arizona/Nevada border

The Hoover Dam – Everything You Need to Know About Visiting – Trips To

I don’t know if this counts (couldn’t find a picture with it full), but

The massive spillway tunnels that reroute high water at the Hoover Dam

History of the Hoover Dam | Geoengineer.org