Does anyone know any history of this bridge? A quick look at Google Maps Street View from Silo Road appears to show brick sides, underpinned by steel work.
The bridge would date from the duplication of the line, which included the deviation between Jindalee and Wallendbeen via Morrison's Hill. This opened 17 June 1917, so the bridge would be about 103 years old. The brick walls were altered to provide wire mesh panels to allow visibilty of approaching vehicles on two roads just west of the line and one east of the line.
My information is that the brick abutments have subsided and the deck now fouls the loading gauge.
Since the road (Burley Griffin Way) is presumably closed at the bridge, vehicles may be diverted down the rather obviously named "Silo Road" west of the line that connects to the Olympic Way just west of the rail bridge on that road (to Young). Smaller vehicles could use an underpass south of the silos and drive through the town itself but trucks are unlikely to fit the underpass.
The existence of a reasonable bypass presumably reduces the need to replace the bridge quickly.
I note that ST24 XPT reversed at Cootamundra today, forming ST23.
Presumably buses were used from Sydney.