Maintenance Manual
The Maintenance Manual provides maintenance personnel with procedures and guidelines for maintaining the highway system in Washington State. It focuses on equipment, materials, facilities, techniques, and other information to carry out maintenance activities of the department. This manual does not establish absolute standards but provides uniform operating procedures and performance guidelines.
Individual Chapters
Chapter 1 Emergency Procedures (PDF 107KB)
Chapter 2 Work Zone Traffic Control and Safety (PDF 334KB)
Chapter 3 Pavement Patching & Repair (PDF 452KB)
Chapter 4 Drainage (PDF 181KB)
Chapter 5 Maintenance of Structures (PDF 268KB)
Chapter 6 Roadside Management (PDF 1.6MB)
Chapter 7 Snow and Ice Control (PDF 276KB)
Chapter 8 Traffic Services (PDF 285KB)
Chapter 9 Electrical System Maintenance (PDF 172KB)
Chapter 10 Miscellaneous (PDF 252KB)
Chapter 11 Maintenance and Design Coordination (PDF 252KB)
Appendix A (PDF 2.3MB)
Appendix B (PDF 293KB)
Revision History
May 2023
March 2021
September 2020
March 2020
March 2020
April 2019
June 2017
April 2017
August 2013
October 2010
February 2008
July 2007
January 2007
February 2005
September 2004
March 2002
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.