Most preliminary bridge sizing still happens in a spreadsheet someone built a decade ago.
I wanted a free, honest, back-of-the-napkin tool that takes a span and a site and gives you a sensible bridge type, a depth, and a cost range in seconds — nothing more, nothing less. No 3D, no false precision. Just the first sketch, done well.
This site is where I'll keep building it in the open, and where I'll share notes from the field along the way.
Background: Changtai Yangtze River Bridge (Wikipedia)
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