Might be great for understanding the basics of bridge structural analysis, but that would be about it. Options for refined analysis that are readily available today did not exist in 1963
It would be way out of date for understanding the AASHTO Standard spec that is still in (limited) use (17th Edition, from 2002). I'm thinking it would be pretty much useless for any version of the AASHTO LRFD spec, which is what is used currently for design.
It would also be way out of date with regard to economic efficiency, and the materials, methods, and options for construction.
Newer books are available that also cover the basics, but also cover the modern tools for design, incorporate the advances in understanding of material behavior (especially concrete), are written referencing the modern design specifications, and recognize the current state of practice with regard to economical design.
Rod Smith, P.E., The artist formerly known as HotRod10
From the 2015 edition: "The first edition of the Bridge Design Practice Manual (BDP) was published in 1960, and the second and third editions were published in 1963 and 1971, respectively. The
BDP has been published as a live document continuously since the 1990s."
The 1960, 1971 and 2015 editions do not have a rigid frame example and/or chapter. The 1963 edition has a 9 page example of a single-span rigid frame (28' length) in Chapter 14 "Structures Under Roadway Embankments." Nine pages of soil pressure, equivalent strip, moment distribution, and moment envelope to determine rebar.