43 C.F.R. § 421.12 Abandoned and unattended property.
Title 43 - Public Lands: Interior
(a) Abandonment of any vehicle or other personal property is prohibited, and such property may be impounded by the Bureau of Reclamation. (b) Leaving any vehicle or other personal property unattended for longer than 25 hours, without prior permission of the Bureau of Reclamation, is prohibited and such property may be impounded by the Bureau of Reclamation. In the event unattended property interferes with the safe and orderly management of the Hoover Dam facilities, it may be impounded by the Bureau of Reclamation at any time.
Title 43: Public Lands: Interior
PART 421—RULES OF CONDUCT AT HOOVER DAM
§ 421.12 Abandoned and unattended property.