This guide fills a long-standing need for technical information for the design and construction of crane-supporting steel structures that is compatible with Canadian codes and standards written in Limit States format. It is intended to be used in conjunction with the National Building Code of Canada, 2005 (NBCC 2005), and CSA Standard S16-01, Limit States Design of Steel Structures (S16-01). Previous editions of these documents have not covered many loading and design issues of crane-supporting steel structures in sufficient detail.While many references arc available as given herein, they do not cover loads and load combinations for limit states design nor arc they well correlated to the class of cranes being supported. Classes of cranes are defined in CSA Standard B167 or in specifications of the Crane Manufacturers Association of America (СМЛЛ). This guide provides information on how to apply the current Canadian Codes and Standards to aspects of design of crane-supporting structures such as loads, load combinations, repeated loads, notional loads, monosymmetrical sections, analysis for torsion, stepped columns, and distortion induced fatigue.