This manual has been developed to simplify and facilitate the structural design of box culverts and keep pace with developments in structural analysis technologies and employ them to reach the best use. It is considered as a practical book suitable for the current methods used in the design, and since the finite element programs have become a basic requirement for design in most of professional companies, it is necessary to link these programs to the manual solutions and understand the loads, analysis and outputs to reach the worst-case scenarios without forgetting the economic factors which is located in the second place after safety. The author has relied on the basic AASHTO LRFD Bridge Design Specification, Seventh Edition (2014). For more details, please visit https: //centralwestpublishing.com