I listed it as free, above, which it is - if you're happy to park in the roadside layby spaces on the Arizona side (this entails a little walk down the hill to the dam). If you park in the carpark on the Nevada side (ie the side you'll be coming from if you're travelling from Vegas), it will cost you US$7. If you take a tour, it'll cost US$11.00 (US$9 for seniors and under 16s) for the powerplant and $30 for the full dam tour.
Park a little way up on the Arizona side, where it's free - you'll save the $7 parking charge in the Nevada carpark.
Time your visit carefully - never go on a Friday on a Sunday, when traffic between Vegas and Arizona is fiendish. I did it once, and it took three hours.
- Families with teenagers
- Mature travellers
- Seasoned travellers
- Great views / scenery