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The last covered bridge of Arizona on AZ 73/US 60T

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kphoger:
What is the point of covering a bridge, anyway?

Max Rockatansky:
Up around Whiteriver almost certainly snow fall accumulation.  In snow prone areas such as the Mogollon Rim the deck of a wooden bridge could be overloaded.  The covered span would slope the snow accumulation off to the sides of the structure.  With modern spans there isn’t much of a point beyond aesthetic.

GaryV:
Another reason for covered bridges was to keep rain off the wooden supports and decking. New roof shingles would be easy and inexpensive to replace. Not so with rotten trusses.

US 89:

--- Quote from: GaryV on September 22, 2023, 10:37:01 AM ---Another reason for covered bridges was to keep rain off the wooden supports and decking. New roof shingles would be easy and inexpensive to replace. Not so with rotten trusses.

--- End quote ---

That was the main reason from my understanding. Obviously steel trusses don't rot, which is why covered bridges are largely not a thing anymore...

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