Regulation No.16 provided among other things 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 high water 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 permi