Twilight falls over Hoover Dam.

WS PAN Man arc welding next to truck beside construction bridge at Hoover dam / Boulder City, Nevada, USA

MS Man arc welding next to truck beside under construction bridge at Hoover dam / Mojave, California, USA

CU Man arc welding next to truck / Boulder City, Nevada, USA

CU Man arc welding next to truck / Boulder City, Nevada, USA

CU Man arc welding next to truck / Boulder City, Nevada, USA

WS T/L View of Hoover Dam near bridge under construction at night / Mojave, California, USA

CU Man arc welding next to truck / Boulder City, Nevada, USA

CU Man arc welding next to truck / Boulder City, Nevada, USA

CU Man arc welding next to truck / Boulder City, Nevada, USA

MS Man arc welding next to truck beside under construction bridge at Hoover dam / Mojave, California, USA

MS Man arc welding next to truck beside under construction bridge at Hoover dam / Mojave, California, USA

CU Man arc welding next to truck / Boulder City, Nevada, USA

MS Man arc welding next to truck beside under construction bridge at Hoover dam / Mojave, California, USA

WS Visitor walking in dam / Nevada, USA

WS Bridge above river / Nevada, USA

POV Electrical towers in desert / Hoover Dam,Arizona,USA

MS Electrical towers in mountains / Hoover Dam,Arizona,USA

MS TS Highway along dam / Arizona, USA

WS Bridge above river / Nevada, USA

WS AERIAL View of Car, van moving on Hoover Dam bypass bridge / Arizona, United States

WS AERIAL View of Hoover Dam bypass bridge / Arizona, United States

WS AERIAL View of Hoover Dam bypass bridge / Arizona, United States

a distinct white line can be seen on the rocks indicating the amount of low water levels on lake mead.