Does that say "Boulder City Blvd"? Surprising that "Nevada Highway" wasn't used.
Also, I kind of expected the signage on that to say "Boulder City, Hoover Dam," without a street name, to encourage pass-through tourist traffic in B.C. Shrug.
My guess is that a post-mounted "Boulder City, Lake Mead / Exit 15A" supplemental sign will be used for this purpose. No need to include Hoover Dam there (since that is better accessed via existing Exit 2), but the most direct path to Lake Mead from this direction will still be to go through town.
Google Street View suggests that Boulder City isn't too attached to the "Nevada Highway" name on existing US 93 northbound from the main downtown intersection. Backlit street name signs on traffic signals read "US 93", 1 newer street name sign at a cross street reads "US 93", about 2 street name signs at minor cross streets have older "Nevada Hwy" blades, and an additional 2-3 cross streets are missing the 93/Nevada Hwy blade altogether. Pretty much all of the street name signs at cross streets southbound from downtown all read "US 93"–although that makes sense with Nevada Way being a separate roadway through their historic downtown. My guess is that NDOT recommended the city to put a street name on old US 93, and the the city chose "Boulder City Blvd" so they could have the city's name on the freeway signs for the Business Route–or, since the business route is still currently owned/maintained as a state highway, NDOT just chose this name.
I'm actually more surprised that the casino access road is actually named "Railroad Pass Casino Rd". I'd have thought they'd just call it "Railroad Pass Road" so that the road could be named for a semi-geographic feature and not a business...