Built in 1932 the little bridge served as a gateway to the other side of town but due to rapid inundation and large debris striking on a regular basis the structure was diagnosed with advanced concrete cancer.

Problems with the structure were identified as far back as 2012.

Earlier this week bridge access closed when Mount Isa City Council workers barricaded and fenced off the area.

Access across the river at Isa St crossing will be pedestrian and cyclist only until November while the Council build a new bridge.

Deputy Mayor Phil Barwick said the bridge was deteriorating, and the new structure would have a higher flood immunity and increase carrying capacity from the existing five tonnes to be capable of carrying a loaded semi.

"The new bridge will be a real asset to the community and will significantly improve the local amenity," Cr Barwick said.

The Isa St bridge was the only access for mine workers to get to work however that changed when the Grace St bridge was built in 1967.

Opened on Thursday, July 27 1967 the Grace Street bridge was heralded as a new era in the corridor of movement between the Flinders and Barkly Highways.

At that opening, then Chairman of Mount Isa Shire Council George McCoy, said instead of all traffic meeting at Isa, West and Miles Streets it will diversify traffic and thus be beneficial to road safety.

He acknowledged while Isa Street Bridge had served the community well for thirty-five years, it was fortunate there had never been a life threatening emergency when the bridge was impassable.

Council expects the new Isa St bridge to open in November.

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