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Zilwaukee Bridge Thread


wolverine

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This is a thread to post pictures and thoughts about this beast that carries I-75 over the Saginaw River.

Wikipedia mentions that the bridge will close in 2011 for extensive repairs.

Also, has anyone noticed the West facing side of the Southbound span? There's a very large dip in the span that I never noticed before. Talk about way out of alignment, it's not a gentle curve from deflection, rather a sharp bend that lowers several feet. I know we are all familiar with teh dips and drops you feel when you drive over it, but what I saw today did not look good. It appears there was repairs made on that section before. There's also an exposed compression member beneath it. Obviously if this posed any sort of danger, the bridge would be closed, but you can't help but wonder how long this bridge will be around.

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As someone who absolutly hates driving over bridges, you bet yet sweet potatoes that I've noticed that dip. The Zilwaukee in particular is my least favorite bridge I drive over on a fairly regular basis. I have a few shots of it, not in this computer, that I can transfer over and put up sometime.

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Ah, but that dip isn't just one I felt, I could actually see it. The elevation of the bridge is somewhat of an elongated arch, except the center of the arch section is dropping downward compared the other section which remain somewhat level. The dip can definitely be measured in feet.

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The one memory I have of that bridge is breaking down on it in an RV when I was younger. And it was hot and I was up there for hours.

Needless to say, I don't feel too fondly for it. (Even though I realize it wasn't the bridge's fault for being so steep. Or is it??)

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I did a quick calculation based on my very limited knowledge in civil engineering.

TOTAL SPAN = 8000 ft HIGHEST POINT = 125

Obviously we know the slope of the bridge is not completely linear, but curved. Therefore, I'm going to calculate for where the slope is the steepest across 2/3 of the incline.

Total Span/2 = 4000 ft.

Solving for steepest section only (2/3)(4000) = 2666.7

Using trig I get an angle of 2.68 degrees. A vehicular ramp should never go more than 11 degrees, although they sometimes do in parking structures with narrow footprints. No vehicle should ever burn out on incline that's three degrees, even if it's a mile long.

No funk, you made me do all that work!! I do too much for people.

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I actually sort of like the Zilwaukee. When im in a truck i can see over the edge, so thats pretty cool.

I havent been on her in a while. So this one is seriously measurable in feet?

Last Summer:

254412552_a09c5bf1a0_b.jpg

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I see them. Its hard to forget where they are once you've had to sit next to them for almost 45 minutes waiting for a freighter to pass sitting in a car in the middle of July when its almost 100 degrees out (even if you were only 10 years old).

Dtown, here is another picture from the same site which annotates the original bridge.

zilwaukee_aerial2_a.jpg

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