It shall be unlawful for any person or persons to erect any fence, wharf, boat house, building or other structure whatsoever to seaward of the Public Highway or Road running along highwater mark of the Harbor of Pago Pago as described in Section I of the Ordinance relating to a Public Highway in Pago Pago being number 15 of 1900, without special permission from the Commandant of the United States