Old Eastern Avenue Bridge, Metal truss bridge in Toronto, Canada.

The Old Eastern Avenue Bridge spans the Don River in Ontario with two distinct sections built from different materials. A northern concrete arch section carries utility lines, while a southern metal truss section once carried vehicle traffic across the river.

The southern Howe truss bridge was built in 1933 for $70,864.07, replacing a wooden bridge damaged by Don River ice in 1900. It carried Eastern Avenue traffic until it was closed in 1965 after the Don Valley Parkway opened. A 2022 structural assessment found it at risk of failing, and it was dismantled between September and October 2024 for the East Harbour Transit Hub project.

The southern span was long nicknamed the King Street Bridge, a misnomer that stuck. Its Howe truss design matched the Queen Street Viaduct and Sir Isaac Brock Bridge, and the 1933 crossing cost $70,864.07. The northern concrete arch, the Gas Line Bridge, was built for Consumer's Gas and still carries an Enbridge Gas main.

The southern truss span was dismantled between September and October 2024, so only the northern concrete arch, which carries an Enbridge Gas main, still stands over the Don River. The site is fenced off and disconnected from the road network, with the Don Valley Parkway and rail lines nearby considered hazardous, so the remaining structure is seen from a distance rather than up close.

The bridge is often overlooked despite combining two completely different engineering systems side by side. The contrast between the heavy concrete arch and the delicate metal framework shows how practical problem-solving shaped its design rather than artistic intent.