The AASHTO Manual for Bridge Evaluation, Fourth Edition (2026), provides bridge owners and agencies with a single document for evaluating and load rating highway bridges. The manual is organized into eight sections that follow the phases of an inspection and evaluation program, beginning with bridge files and documentation and the objectives and components of bridge management systems. Subsequent sections address inspection procedures and material testing, including interpretation and evaluation of test results. Load rating provisions are followed by coverage of fatigue evaluation of steel bridges, distinguishing load-induced from distortion-induced fatigue damage. A separate section treats load testing and factors that influence the load-carrying capacity of bridges. This edition incorporates interim revisions to the third edition plus updates from the National Bridge Inspection Standards, gusset plate additions and examples, a new load testing chapter, and permit truck equation changes. It is intended for bridge owners, evaluation engineers, and inspection program staff.