This publication provides introductory technical guidance for civil engineers, bridge engineers and construction managers interested in maintenance and repair of steel and concrete bridges. Here is what is discussed: 1. INTRODUCTION, 2. SURFACE COATING, 3. JOINT MAINTENANCE, 4. CATHODIC PROTECTION, 5. GENERAL REQUIREMENTS, 6. CRACK REPAIRS, 7. SPALL REPAIR, 8. JOINT REPAIR, 9. ABUTMENTS AND WINGWALLS, 10. BRIDGE SEATS, 11. COLUMNS AND PILES, 12. STRINGERS AND BEAMS, 13. DECKS, 14. REPLACEMENT OF CONCRETE MEMBERS, 15. GENERAL UPGRADE METHODS, 16. STRENGTHEN INDIVIDUAL MEMBERS, 17. PRESTRESSED CONCRETE MEMBERS.