For US practice, this is perhaps the best single book on bridge design currently available. The author should be commended for putting forth a Herculean effort to assemble so much information for the benefit of others. The only major weakness is that, like nearly all books on bridge design, the coverage of substructure design is quite limited.
Nevertheless, every bridge engineer should own a copy of this book. Moreover, if you are prepared to buy only one book, this is the one to buy. Since the book is unfortunately out of print, if you can find a used copy at a good price, grab it!