Site information:

On Amargosa Rd, 2.0 mi W of I-15 and Phelan Rd, 6 mi NW of Hesperia

The location from the OHP above doesn't make a lot of sense, as those roads don't really cross, and Amargosa is a frontage road to the 15, so 2 mi W isn't accurate.  In any case, the site no longer exists.  The photo is my best guess as to where it might have been located, without doing more research into this.

Plaque information:

No plaque

OHP description:

Miles Mahan began building Hula Ville in 1955 after retiring as a 'carny,' or carnival worker. Over the years, he put his statues and poems together in the desert, on Interstate 15 near Hesperia. Demolished 9/97