Construction Manual
This manual provides department construction engineering personnel instruction for fulfilling the objectives, procedures, and methods for construction administration of Washington State transportation projects. The Construction Manual is intended as a reference book.
The Construction Manual can be downloaded in pdf format and printed without charge.
Individual Chapters
Foreword (PDF 168KB)
Contents (PDF 220KB)
Chapter 1 Administration (PDF 1.3MB)
Chapter 2 Earthwork (PDF 3.7MB)
Chapter 3 Production From Quarry and Pit Sites and Stockpiling (PDF 3.1MB)
Chapter 4 Bases (PDF 365KB)
Chapter 5 Surface Treatments and Pavements (PDF 553KB)
Chapter 6 Structures (PDF 4.4MB)
Chapter 7 Drainage Structures, Sewers, and Conduits (PDF 3.2MB)
Chapter 8 Miscellaneous Construction (PDF 2.7KB)
Chapter 9 Materials (PDF 1.7KB)
Chapter 10 Documentation (PDF 1.2KB)
Chapter 11 Forms (PDF 345KB)
Revision History
M 41-01.43
M 41-01.42
M 41-01.41
M 41-01.40
M 41-01.39
M 41-01.38
M 41-01.37
M 41-01.36
M 41-01.35
M 41-01.34
M 41-01.33
M 41-01.32
M 41-01.31
M 41-01.30
M 41-01.29
M 41-01.28
M 41-01.27
M 41-01.26
M 41-01.25
M 41-01.24
166,800 electric vehicle
registrations in Washington in 2023, up from 114,600 in 2022.
87 wetland compensation sites
actively monitored on 918 acres in 2023.
25,000 safe animal crossings
in the Snoqualmie Pass East Project area since 2014.