We were heading to camp at Lake Mead last minute with no reservations and were nervous about getting a spot, but we showed up at Echo Bay on a weekend and there was practically NO ONE there...to this day I still have no idea why, maybe it was a bit early in the season.  Seems like it was pretty much just an overflow for those that did not get other sites, but it was totally fine to me.

Make sure to get a site under a tree with some shade.  All sites had restrooms, trash, and water nearby.

There is not a great place nearby to get groceries, so make sure to stock up beforehand.  There is a little convenience store at the site but pickings were very slim.

There's a boat ramp at the bottom of the road, and some nice places to walk/hike along the lake.

Only downside is that it is pretty remote and it was an hour drive to Hoover Dam and the main lake Mead recreation areas.