The province says crews will start removing the Canadian Pacific Railway bridge over the Highwood River next month.
The bridge, built in 1892, creates a bottleneck in the river.
Progressive Conservative Rick Fraser says scrapping the structure will help increase the capacity of the river's flow.
The bridge hasn't carried any rail traffic since 2010.
Thousands of people were forced from their homes in High River in June when floodwaters devastated much of the community.
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