There's already a Bridge of the Month competition which you should take a look at it if you haven't already.
Now there's a new Bridge of the Month newsletter, from Bill Harvey, the masonry arch bridge specialist perhaps best known for his Archie-M arch analysis software. The first issue is available online [PDF] and features Llanelltyd Bridge. It discusses the geometry of the arch, the difference between a three-centred and an elliptical arch, and the difficulty of modelling and hence analysing a bridge with irregular, distorted arch geometry.
You can subscribe to receive future newsletters at http://eepurl.com/ccAyL.