Structure Technical Policies (STPs)

Structure Technical Policies (STPs) are the authoritative requirements in DES that have been developed to ensure the structures designed or modified meet our expectations for safety, economy, maintainability, and functional life. The terms “must” and “shall” are used for mandatory requirements. 

STPs are organized to closely align with the organization of the AASHTO LFRD BDS.  They are set to design standards and methods of analysis in addition to those specified in the design specification by establishing exceptions and additions to the design specifications, limitations of design specifications, required method or process for using the design specifications, and design or analysis criteria for an area not addressed in the design specifications.

STPs also mandate the use of a certain bridge or earth retaining system components or features. However, they were developed to be mindful not to stifle innovation.

STPs are approved by the Deputy Division Chief of Bridge Design (BD) or Structures and Engineering Services (SES). Adoption of STPs is mandatory for all projects for which Type Selection has not taken place. The Deputy Division Chief of BD or SES must approve any deviation from technical policies.

Engineers are responsible for checking this webpage for new or updated STPs prior to Type Selection.  

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