eli5 Why are bridges always set at the same level (straight rather than one side shorter than the other)?

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I just realized last night I’ve never seen that, even though often times bridges are connecting cliff faces or different bodies of land. So… why? Why do they always seem to start on the same level?

Also please let me know if that’s the wrong tag… mental five year old me wasn’t sure.

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Anonymous 0 Comments

The river bridge that I cross every time I go to or from work is perceptibly sloped. It was the most practical way to buid that particular bridge. Building them level when possible is often easier though.

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