$\"\"$

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The length of the major axis is $\"\"$ -axis.

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The height of the arch at the center is $\"\"$ .

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The general form of ellipse equation is $\"\"$ where $\"\"$ .

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Substitute $\"\"$ in $\"\"$ .

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$\"\"$ .

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The height of the arch $\"\"$ from the center is $\"\"$ .

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Hence the ellipse is passing through the point $\"\"$ .

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Substitute $\"\"$ in $\"\"$ .

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$\"\"$

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$\"\"$ .

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$\"\"$

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$\"\"$

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$\"\"$

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$\"\"$

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Therefore, the span of the bridge is $\"\"$ $\"\"$

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The span of the bridge is $\"\"$ .