|Name||Billwil Bridge, Switzerland|
|Where||Billwil, Saint Gallen, Switzerland|
|Latitude||N 47 27' 35"|
|Longitude||E 09 09' 49"|
|Why||Takes road over River Thur to village of Billwil|
|Overall type||Arch with 3 hinges.
This was Robert Maillart third bridge design - he was developing his idea of a three hinged arch. The closed spandrel makes the bridge appear to be a beam structure of variable depth.
|Rise of arch||4 m.|
|Main spans||2 spans of 35 m.|
|How to read a bridge||Read more about arches.....
Read more about the book metaphor.....