The 18th century Grade II listed structure crumbled on December 29, 2015 as the River Wharfe rose to historic levels.
Its collapse came as flooding hit large parts of northern England, leaving many communities – including homes in Tadcaster – under several feet of water.
The loss of the bridge, which had already been closed due to safety concerns, left the North Yorkshire town divided, with residents and visitors having to negotiate a 10-mile detour to get from one side of the river to the other.
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An 18th century bridge was rebuilt after crumbling in the 2015 floods
The division has strained businesses in the town and North Yorkshire County Council said contractors have worked around the clock to complete a job that should have taken two years in just over 12 months.
"There is great anticipation in the town," said Don Mackenzie, North Yorkshire County Council's spokesman for highways.
"Its community has been literally cut in two for a year by the bridge's collapse and people have been eagerly looking forward to the time when they will be reconnected. We thank them for the patience and fortitude they have shown throughout the year.
Britain's FLOODS Tue, August 2, 2016
Heavy rain and snow fall cause severe flooding and extreme weather across the UK.
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Floods cause havoc across Birmingham
Many homes in Tadcaster wee affected by the floods in northern parts of England
Its community has been literally cut in two for a year by the bridge's collapse and people have been eagerly looking forward to the time when they will be reconnected
Don Mackenzie, North Yorkshire County Council
"I am very proud of the enormous effort made by our contractors, Balfour Beatty, and our bridges team to complete a very challenging project of this kind in little more than half the time it would normally take."
The reconstruction, which has included a widening of the structure, has been funded with £3 million from the Government and £1.4 million from the York, North Yorkshire and East Riding Local Enterprise Partnership.
Friday's reopening will be marked by a parade led by pupils from the town's three primary schools.
The reconstruction of the bridge will be further celebrated in April when Tadcaster hosts the start of Day 2 of the Tour de Yorkshire bike race.
The reconstruction of the historic bridge cost over £4 million pounds
The bridge collapsed four days after it was closed on Christmas Day 2015 due to safety concerns.
North Yorkshire County Council said more than 640 tons of water every second was hitting the bridge at its peak – the highest flow rate recorded in 30 years.
Government minister Greg Clarke walked across the bridge, inspecting the situation, hours before its dramatic collapse.
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