Loft of Westminster Bridge?

[Kanastrous]

Okay, here's an obscure chunk of information that so far I've failed to find...maybe someone here knows what I'm after.

I need the loft or radius of Westminster Bridge, in London. That is, seen in lengthwise profile, the roadway/walkway has a very gentle radius to it, lower at the approaches and highest at the center of the span.

If anyone has that information, or a bright idea as to where to find it, I'd be very grateful.

My gratitude plus $2 will buy you a cup of coffee: if you pony up the $2, find the coffee shop, order the coffee and pay at the counter, I'll do the rest.

Seemed sort of vaguely like a 'Science' question, but if it's more of an 'Art' question I trust the mods will move it to where it belongs...

[Spoonist]

There is a bunch of 3d models out there, isn't that a good place to start?

[Kanastrous]

Yes, there are dimensions to be pulled from those but I'm hoping for a figure from documentation. The guys at Transport for London may have it but I don't hold out much hope of hearing back from them any time soon.

[madd0ct0r]

I could give you an estimate based off normal slopes required for drainage, but bridges tend to get special circumstances due to being old and a bugger to alter.