page 3 of the pdf listed in post#4 is extremely helpful...
Can I bring a weapon across Hoover Dam?
No. The following list identifies some of the more common weapons that are prohibited:
• Firearms • Knives (other than kitchen utensils)
• Pepper spray • Brass knuckles
• Mace • Batons
This is NOT a complete list. The inspecting officers at Hoover Dam may use their professional
discretion in identifying weapons and deny the vehicle access to the dam.
Additionally, knives of any kind and weapons are not allowed...
Added help....
from corner of map given in post#9...
Firearms are prohibited on Hoover Dam property.
Additionally, ANY vehicle is subject search. Various kinds are labelled as WILL BE searched.
English is kinda extra super plain here, does the govt authority want firearms (or staffs, batons, knives, munitions, etc.) on, around, over, below, or sideways on H Dam property? HINT: NO
something about a gunshop said...I mean, wow