Pam, our tour guide, was exceptional and a real historian of the dam and Nevada in general. The three hour tour allowed plenty of time to view the dam and photo opportunities. The biggest disappointment is the dwindling lake levels. The demand for water from the Colorado River far outreaches the demand. If a solution is not found, the lake will be dry in 15 years. If you are at least a little interested in history, this is a must see.