Hoover Dam is 34 miles (54.4 km.) from Las Vegas. 726 feet high (220.00 meters) from bedrock. Engineering wonder of the modern world. The Hoover Dam is open from 5am - 9pm. Guided powerplant and self-guided visitor center tickets may be purchased online or on site. Dam Tour tickets may be purchased only on site at the Visitor Center. Please visit website for further information.