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. Tours inside and outside of dam available: Parking fee: $10.00 Discovery Tours: Adults (Ages 17-61) $15.00 Seniors (62+) $12.00 Juniors (Ages 4-16) $12.00 U.S. Military $12.00 U.S. Military in Uniform - Free Children (Ages 0-3) Free Operating Hours: 9:00 AM - 5:00 PM The Hoover Dam Visitor Center is open every day of the year except for Thanksgiving and Christmas. All times are for the Pacific time zone.