Re: Lake Mead, Boulder marina..
It's been about 10 years ago that Las Vegas Bay Marina moved out of Las Vegas Bay and went to Hemenway (not Hemingway like the writer). It's been about 3 years since Lake Mead Marina moved out of Boulder Harbor (adjacent to Saddle Island) and was bought by Las Vegas Bay (Now Las Vegas Boat Harbor Marina) and they are operated together at Hemenway.
The confusion you have is that Boulder Harbor Launch Ramp is still operational (adjacent to Saddle). It used to be basically connected to Lake Mead Marina, but they ran out of water in the protected harbor and had to move the Marina . . . All of this is in the Boulder Basin and stretches from Boulder Harbor, across Boulder Beach and ends at The Hemenway Wall . . .
If you need maps, drop me a PM.