Find information on preliminary studies, planning criteria, structure type selection and aesthetic consideration. Also find guidance for preparation of bridge plans, specifications and estimates.
Design memorandum
Design memorandum are issued as interim updates to the Bridge Design Manual. Active design memorandums supersede the Bridge Design Manual contents and are currently enforced.
- 01-2022 Floating Bridge and Special Structures Design Unit Manager (PDF 92KB) revises Chapter 1 - General Information (PDF 1.0MB) with the roles and responsibilities of the Floating Bridge and Special Structures Design Unit Manager.
- 06-2021 Plan stamping and signature policy (PDF 181KB) revises Chapter 1 - General Information (PDF 1.0MB) with an updated plan stamping and signature policy
- 12-2020 Removal of bridge guidance from WSDOT website (PDF 350KB) revises Chapter 2 - Preliminary Design (PDF 3.6MB) and incorporates the guidelines and requirements for aesthetic design into the Bridge Design Manual.
- 10-2020 BDM Section 11.1.2 Bridge Standard Drawings (PDF 74KB) revises Chapter 11 - Detailing Practice (PDF 1.4MB) and provides requirements drafting and detailing of bridge plan sets.
Related manual chapters
Chapter 1 - General Information (PDF 1.0MB) provides background, organizational information, roles and responsibilities and quality control procedures.
Chapter 2 - Preliminary Design (PDF 3.6MB) provides guidance and criteria for developing preliminary designs and plans.
Bridge Design Manual
Complete Bridge design guidance is found in the Bridge Design Manual (M 23-50).