Pontoon bridges

bridge that uses floats or shallow-draft boats for support (temporary or permanent)

cantilever bridge in Kolkata, India

pontoon swing bridge over St. Anna Bay in Willemstad, Curaçao

Bassano del Grappa bridge

hybrid cable-stayed/pontoon bridge across Salhusfjorden in Vestland county, Norway

Soviet model of mobile pontoon bridge

Wikimedia list article

floating bridge crossing the Bergsøysundet strait in Møre og Romsdal county, Norway

floating bridge over the Berbice River in Guyana

bridge in United Arab Emirates

Ganzhou, Jiangxi

bridges constructed during second Persian invasion of Greece

floating bridge over the Demerara River in Guyana

former floating bridge crossing the River Derwent in Hobart, Tasmania, Australia