Mosman Bay Sewage Aqueduct

The Mosman Bay Sewage Aqueduct is a steel arch structure spanning the bay that combines sewage pipes with a public pathway for pedestrians. The bridge was built with multiple curved supports to handle both functions while providing safe passage across the water.

The structure was built between 1899 and 1901 as part of a new sewage system serving Sydney's northern suburbs. Its construction solved the challenge of carrying waste over the water while allowing foot traffic to cross the same span.

The structure represents Federation-era engineering excellence and remains an integral part of the New South Wales State Heritage Register since 1999.

The footpath is open to the public and provides a direct route through the adjacent park area. The crossing is walkable most times, though occasional closures may occur due to maintenance work.

This structure is unusual because it serves as both a sewage transport system and a walkable bridge at the same time. Few other such structures in Sydney combine these two purposes in the same way.