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Design Memorandums

We are continuously improving the way we do business. From time to time design memorandums are issued as interim updates to the Bridge Design Manual.

  • Active Design Memorandums supersedes the contents of the Bridge Design Manual.
  • Inactive Design Memorandums have been incorporated into the latest revision of the Bridge Design Manual. They are provided to document and clarify the evolution of the Bridge Design Manual.
  • Archived Design Memorandums - if there is an old design memorandum that is not listed on the table below and you would like a copy, please contact Stephanie Williams at 360-705-7484.

Active Design Memorandums

Number  

Date

Subject

10-2014

11/04/2014

Archiving Design and Check Calculations, Design Files, and S&E Files (pdf, 175kb)

09-2014

09/03/2014

Buried Structures (pdf, 96kb)

08-2014

08/30/2014

Bridge Traffic Barrier Design Requirements for Fall Protection (pdf, 72kb)

07-2014

07/25/2014

Design Requirements for Temporary Bridges (pdf, 52kb)

05-2014

05/06/2014

Bridge Anchor Types (pdf, 51kb)

03-2014

04/09/2014

Column Reinforcement

02-2014

03/26/2014

Deep Foundation Program

01-2014

02/19/2014

STD Plans Noise Barrier Wall Type 14 (pdf, 541kb)

14-2012

12/07/2012

STD Plans Noise Barrier Wall Type 11 (pdf, 93kb)

Inactive Design Memorandums

Number

Date

Subject

06-2014

06/30/2014

Buried Structures (pdf, 94kb)

04-2014

04/09/2014

Bridge Anchor Types (pdf, 51kb)

 

09-2013

11/14/2013

Elastic Design In Lieu of Overstrength Forces for Capacity Protection (pdf, 33kb)

08-2013

10/17/2013

Self-Consolidating Concrete for Bridges and Structures (pdf, 78kb)

07-2013

09/22/2013

Requirements for Partially Filled Steel Piles and Shafts (pdf, 136kb)

06-2013

08/07/2013

Intermediate Diaphragms for Prestressed Concrete Girder Bridges (pdf, 36kb)

05-2013

07/01/2013

Bridges With MSE Wall Supported Abutments (pdf, 192kb)

03-2013

03/01/2013

Abutment Participation as Part of Earthquake Resisting System (pdf, 179kb)

02-2013

02/08/2013

Placement of Post-tensioning Tendon and Anchorage Placement (pdf, 46kb)

01-2013

01/17/2013

Lateral Confinement for Oversized Shafts for SDCs C and D (pdf, 90kb)

   

13-2012

10/07/2012

Structural Design Recommendations of CFT and RCFT for Bridge Foundation (pdf, 409kb)

12-2012

09/19/2012

Slab Shrinkage (pdf, 20kb)

11-2012

09/14/2012

Disk Bearings (pdf, 22kb)

10-2012

08/15/2012

Extension of Column Reinforcing Into Crossbeams (pdf, 310kb)

09-2012

07/31/2012

Seismic Design of Underground Structures (pdf, 104kb)

08-2012

07/04/2012

Extended Strands Continuity Design Criteria (pdf, 101kb)

02-2012

02/06/2012

Guide Specifications for LRFD Seismic Bridge Design,
2nd Edition 2011
(pdf, 248kb)

   

08-2011

12/09/2011

Moment Slab (pdf, 93kb)

05-2011

10/07/2011

SEW Bridge Abutment Configuration (pdf, 192kb)

04-2011

09/07/2011

WSDOT Policy For Use Of Seismic Isolation Bearings (pdf, 33kb)

02-2011

07/20/2011

New LRFD Chapter 15 - Design Of Sound Barriers (pdf, 163kb)

01-2011

04/19/2011

Fatigue Design Categories For Pole Structures (pdf, 74kb)

   

08-2010

12/15/2010 

Minimum Flexural Reinforcement 

07-2010

06/28/2010

Bearing Resistance of Shaft Groups 

06-2010

06/25/2010 

Bridge Traffic Barrier 

05-2010

06/01/2010 

Unit Weight of Concrete 

04-2010

05/20/2010

Bridge Load Rating Policy 

03-2010

04/14/2010

Bridge Load Rating Policy 

02-2010

02/16/2010 

LRFD Guide Specifications for Pedestrian Bridges 

01-2010

01/08/2010

Wall Type Design Specifications and Stamping Policy (pdf, 48kb)

   

15-2009

02/10/2009

Use of SCC in Structural Applications

14-2009

10/28/2009

Prestressed Girder Dimensions and Allowable Concrete Compressive Stress

13-2009

10/06/2009

Design of Steel Reinforced Elastomeric Bearings

12-2009

08/20/2009

Confinement Reinforcement for Columns and Shafts

11-2009

07/17/2009

LRFD Guide Specs For Pedestrian Bridges

10-2009

07/15/2009

Skin Reinforcement Requirement

09-2009

07/07/2009

Interface Shear Transfer - Shear Friction Design

08-2009

06/23/2009

Reduced Column Base Fixity

07-2009

05/06/2009

Electronic Plan Sharing Policy

06-2009

04/22/2009

Curved Precast Girders

05-2009

04/16/2009

Computer Generated Design Calculations

04-2009

04/10/2009

AASHTO Guide Specifications for LRFD Seismic Bridge Design Amendments

03-2009

03/18/2009

Deep Foundation Program Options

02-2009

03/14/2009

Minimum Depth Limitations on Precast Slab Members

01-2009

02/10/2009

Skin Reinforcement Requirement

17-2008

12/15/2008

Load Rating Requirement for Complex Bridges

16-2008

12/12/2008 

Approach Slab Details 

15-2008

11/14/2008 

AASHTO Guide Specifications for LRFD Seismic Bridge Design Amendments

14-2008

10/16/2008 

Prestressed Girder Dimensions and Span Capability 

13-2008

10/02/2008 

Bridge Mounted Signs 

12-2008

09/12/2008 

Deep Foundation Program Options and Design Force Demand 

11-2008

09/05/2008 

Maximum Superstructure Length

10-2008

08/04/2008 

Wall Type Design and Stamping/Signing Responsibilities for Special Design Retaining Walls

09-2008

07/28/2008 

Full Depth Intermediate Diaphragms

08-2008

07/18/2008

Column-Shaft Connection Design and Detailing Recommendation 

07-2008

06/18/2008 

DFSAP Program Limitation

06-2008

06/04/2008 

Bridge and Structures Office Contract Plan Seal and Signature Policy 

05-2008

05/16/2008

Computer Generated Design Calculations

04-2008

05/16/2008

Positive Moment Connection at Intermediate Piers 

03-2008

02/18/2008

Implementation of LRFD Guidelines for Seismic Bridge Design 

02-2008

02/08/2008 

STD Plan Retaining Wall 

01-2008

01/29/2008

Steel Truss Bridge Gusset Plates

17-2007

12/31/2007

Implementation of LRFD Guidelines for Seismic Bridge Design

16-2007

12/06/2007

LRFD General Notes - Pile Foundation

15-2007

11/29/2007 

Pipeline Encasement

14-2007

11/02/2007 

Pile Types

13-2007

10/03/2007

New Limits for Long Span Prestressed Girders 

12-2007

09/13/2007 

LRFD Shear Design 

11-2007

08/28/2007

Web bursting Reinforcement for Curved Post-Tensioned Bridges 

10-2007

07/10/2007

Damaged Prestressed Girder Replacement Protocol 

09-2007

05/24/2007 

Load Factor for Live Load in Extreme Event I 

08-2007

05/18/2007 

Bridge Deck Overlay

07-2007

05/16/2007 

Soldier Pile and Lagging Design Requirements

06-2007

04/30/2007 

AASHTO LRFD 4th Edition 2007 

05-2007

04/16/2007 

Noise Barrier Wall on Bridges and Retaining Walls

04-2007

03/04/2007 

Revisions to Prestress Losses 

03-2007

02/28/2007 

Stamping/Signing Responsibilities for Special Design Retaining Walls 

02-2007

01/23/2007 

Bridge Design Office Guidelines on QC/QA 

01-2007

01/18/2007

Simplified Wind Load

11-2006

12/23/2006

Splitting Resistance of Pretensioned Anchorage Zones 

10-2006

11/28/2006 

Elastomeric Bearing for Prestressed Girders

09-2006

10/08/2006 

Flexural Resistance Factor 

08-2006

09/26/2006 

ASTM A 706 Reinforcement Requirement 

07-2006

08/26/2006 

Restriction on CIP Reinforced Concrete Box Girder Superstructures 

06-2006

08/20/2006 

Design Guidance for Non-Redundant Steel Box Girder Bridges 

05-2006

08/12/2006

A-Dimension Revisions

04-2006

07/26/2006

Spliced-Girder Closures

03-2006

07/06/2006

Electronic Plan Sharing Policy

02-2006

04/20/2006

CDF for Soldier Pile Tieback Walls

01-2006

02/27/2006

Concrete Deck Slab Reinforcement

05-2005

09/06/2005

LL Distribution Factor for CIP Box Girders

04-2005

09/06/2005

Use of Deck Members for Bridges

03-2005

04/06/2005

Steel Reinforced Elastomeric Bearing Design

02-2005

03/07/2005

Mylar Modification Policy

01-2005

03/01/2005

Prestressed Girder Dimensions

04-2004

08/16/2004 

Cost Estimate Review Procedures

03-2004

07/22/2004

Shaft Design and Detailing Recommendations / Pile Detailing

02-2004

04/01/2004

Spiral Lap Splice Deleted

01-2004

03/18/2004

Release of Temporary Strands In Prestressed Girders

03-2003

11/20/2003

LRFD Deck Overhang Design Parameters

02-2003

10/28/2003

Column and Shaft Spirals Options

01-2003

08/21/2003

Detailing Procedure for Retaining Walls

13-2002

10/24/2002

BDM Section 9.2-4 Location of Confinement Zones, Extension of Reinforcing Into Crossbeams, Footings and Shafts 

12-2002

09/30/2002 

Concrete Deck Slab Details 

11-2002

09/25/2002 

Segment Limits For Steel Girders

10-2002

09/18/2002 

Field Splice Tolerances 

09-2002

09/17/2002 

LRFD General Notes - Pile Foundation 

08-2002

08/16/2002 

Bridge Bearing Replacement Provisions 

07-2002

07/23/2002 

S-I-P Precast Concrete Deck Panel 

06-2002

07/17/2002

Calculation of Shipping Losses in Prestressed Girders

05-2002

06/24/2002 

Bridge Approach Slab Layout 

04-2002

04/02/2002 

CIP Fascia Panels on Soldier Piles

03-2002

03/19/2002 

LRFD Shear Design 

02-2002

02/26/2002 

Hydraulic Jack Design Requirements 

01-2002

02/25/2002

LRFD Seismic Design

16-2001

12/04/2001

LRFD Wingwall Design

15-2001

12/04/2001

Long Span Prestressed Girders

14-2001

11/09/2001

Bridge Approach Slabs

13-2001

10/23/2001

Hydraulic Jack Design Requirements

12-2001

09/18/2001

Prestressed Concrete and Steel I Girder Bridge Widening

11-2001

09/10/2001

LRFD Seismic Design

10-2001

08/17/2001

LRFD Deck Overhang Design

09-2001

07/12/2001

Anchor Bolt Specifications

08-2001

06/18/2001

Pretensioned Anchorage Zones

07-2001

06/18/2001

Shear Design

06-2001

06/11/2001

Steel Reinforced Elastomeric Bearings Method A Design Procedure

05-2001

06/04/2001

Bridge Drain Types 7 and 8

04-2001

05/24/2001

Abutment Backfill Load Case

03-2001

05/14/2001

Design Policy Memo - C-I-P Load Distribution

02-2001

04/24/2001

Prestressed Girder Stops - (Construction Plan Details)

01-2001

04/13/2001

Prestressed Girder Stops

10-2000

01/10/2000

Reinforced Elastomeric Bearing Pad Shims

07-2000

11/01/2000

BDM, Section 8.3.2-1 Bridge Traffic Barriers

06-2000

07/13/2000

Modification of Bridge and Structures Office Policy Shoring Design for Structures Adjacent to Railroads

05-2000

07/13/2000

AASHTO LRFD Article 5.8.3.5, Longitudinal Reinforcement Requirement

04-2000

04/30/2000

Archiving Design Calculations, Design Files, and S&E Files

03-2000

04/18/2000

Unit Weight of Reinforced Concrete

02-2000

04/17/2000

Approval to use of 11"x17" Paper Plan Sheets

01-2000

04/05/2000

Modification of Bridge and Structures Office Contract Plan Signature Policy