Geotechnical Design Manual

Publication Number
M 46-03
Publication Version
M 46-03.15
Publication Date
Manual Manager
Tony Allen
Materials Laboratory, Engineering and Regional Operations

The Geotechnical Design Manual focuses on geotechnical design, construction, and maintenance to ensure that the soil or rock beneath the ground surface can support the loads and conditions placed on it by transportation facilities.

Individual Chapters

Contents (PDF 436KB)

Chapter 1 Geotechnical Operations and Administration (PDF 656KB)

Chapter 2 Project Geotechnical Planning (PDF 444KB)

Chapter 3 Field Investigation (PDF 813KB)

Chapter 4 Soil and Rock Classification and Logging (PDF 674KB)

Chapter 5 Engineering Properties of Soil and Rock (PDF 3.26MB)

Chapter 6 Seismic Design (PDF 4.06MB)

Chapter 7 Slope Stability Analysis (PDF 478KB)

Chapter 8 Foundation Design (PDF 6.73MB)

Chapter 9 Embankments (PDF 2.3MB)

Chapter 10 Soil Cut Design (PDF 3.61MB)

Chapter 11 Gound Improvement (PDF 256KB)

Chapter 12 Rock Cut Design (PDF 248KB)

Chapter 13 Landslide Analysis and Mitigation (PDF 207KB)

Chapter 14 Unstable Rockslope Analysis and Mitigation (PDF 242KB)

Chapter 15 Abutments, Retaining Walls, and Reinforced Slopes (PDF 82.9MB)

Chapter 16 Geosynthetic Design (PDF 217KB)

Chapter 17 Foundation Design for Signals, Signs, Noise Barriers Culverts, and Buildings (PDF 799KB)

Chapter 18 Geotechnical Design for Marine Structure Foundations (PDF 208KB)

Chapter 19 Infiltration Facility Design (PDF 267KB)

Chapter 20 Unstable Slope Management (PDF 1218KB)

Chapter 21 Materials Source Investigation and Report (PDF 394KB)

Chapter 22 Geotechnical Project Development, Reports, and Support for Design-Build Projects (PDF 432KB)

Chapter 23 Geotechnical Reporting and Documentation (PDF 835KB)

Revision History

December 2021

June 2021

December 2020

July 2019

May 2015

August 2014

December 2013

October 2013

April 2012

November 2011

August 2011

April 2011

November 2010

July 2010

January 2010

November 2008

14 fish passage projects were completed in 2020

improving access to 54.2 miles of upstream habitat.

11,959 incidents responded to

by WSDOT’s incident Response teams during second quarter of 2021, 15% more than same quarter in 2020.

41 Pre-existing Funds Projects Advertised

during the eighth quarter of the 2019-2021 biennium.