POL Government Elected Officials Auditor Mary Hull Caballero Charter, Code & Policies City Code & Charter Online Code & Charter Title 19 Chapter 19.16  Rules And Regulations
19.16.375 Protection of Bridges.

It is unlawful to fasten any watercraft or floating timber to any bridge, or part thereof, or to moor any watercraft or floating timber underneath any bridge or bridge approach within or abutting the corporate limits of the City of Portland.