36 CFR § 327.12 - Restrictions.
(a) The District Commander may establish and post a schedule of visiting hours and/or restrictions on the public use of a project or portion of a project. The District Commander may close or restrict the use of a project or portion of a project when necessitated by reason of public health, public safety, maintenance, resource protection or other reasons in the public interest. Entering or using a project in a manner which is contrary to the schedule of visiting hours, closures or restrictions is prohibited.
(b) Quiet shall be maintained in all public use areas between the hours of 10 p.m. and 6 a.m., or those hours designated by the District Commander. Excessive noise during such times which unreasonably disturbs persons is prohibited.
(c) Any act or conduct by any person which interferes with, impedes or disrupts the use of the project or impairs the safety of any person is prohibited. Individuals who are boisterous, rowdy, disorderly, or otherwise disturb the peace on project lands or waters may be requested to leave the project.
(d) The operation or use of any sound producing or motorized equipment, including but not limited to generators, vessels or vehicles, in such a manner as to unreasonably annoy or endanger persons at any time or exceed state or local laws governing noise levels from motorized equipment is prohibited.
(e) The possession and/or consumption of alcoholic beverages on any portion of the project land or waters, or the entire project, may be prohibited when designated and posted by the District Commander.
(f) Unless authorized by the District Commander, smoking is prohibited in Visitor Centers, enclosed park buildings and in areas posted to restrict smoking.