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.
- 2024-03 Standard Plan Barrier and Moment Slab on Structures (PDF 221KB) revises Chapter 10 - Sign, Barrier, Approach Slabs, and Utilities (PDF 8.6MB) providing guidance for the use of standard plan barriers and moment slab on structures.
- 2024-02 Buried Structure Standard Plan Implementation Updates (PDF 42MB) revises Chapter 8 Walls and Buried Structures (PDF 3.0MB) and Standard Plans E-20.10-00, E-20.20-00 and D-20.10-00.
- 2023-05 WSDOT MSE Wall Support Abutment Bearing Limits (PDF 124KB) revises Chapter 2 Preliminary Design (PDF 3.6MB), Chapter 7 Substructure Design (PDF 2.4MB), Chapter 8 Walls and Buried Structures (PDF 3.0MB), and Chapter 10 - Sign, Barrier, Approach Slabs, and Utilities (PDF 8.6MB) and provides revisions to align with construction clearances in the Design Manual, to provide clarity on minimum height requirements per test level of rigid barriers, to update and incorporate revised metrics for concrete barrier at the TL-4 level, as well as to update related elements such as moment slab design for TL-4 test levels in relation to the other changes.
Related manual chapters
Chapter 8 - Walls and Buried Structures (PDF 3.0MB) provides design guidance for retaining walls, noise barrier walls and buried structures.
Chapter 9 - Bearings and Expansion Joints (PDF 1.5MB) provides design guidance for small, medium and large movement expansion joints, standard bearings and seismic isolation bearings.
Chapter 10 - Sign, Barrier, Approach Slabs, and Utilities (PDF 8.6MB) provides design guidance for structural appurtenances and topics including:
- Sign and luminaire supports
- Traffic barriers, railings, and barrier rehabilitation
- Approach slabs
- Utility installation son new and existing structures
- Anchorage of permanent attachments
- Drainage design
- Bridge security
- Temporary bridges
Bridge Design Manual
Complete Bridge design guidance is found in the Bridge Design Manual (M 23-50).
See all manuals and standards
Disclaimer
The Washington State Department of Transportation (WSDOT) makes these documents available on an "as is" basis. All warranties and representations of any kind with regard to said documents are disclaimed, including the implied warranties of merchantability and fitness for a particular use. The WSDOT does not warrant the documents against deficiencies of any kind. All CAD files were created using MicroGDS files (*.man). The AutoCAD files (*.DWG) were converted as a service to our customers that use Bentley MicroStation and AutoCAD.
However, no attempt has been made to ensure that there were no errors in the conversion process. Receiver agrees that WSDOT cannot be held responsible for problems arising from files which have been converted. Since revisions or additions to the design file drawings may occur at any time, the Receiver agrees to indemnify, defend and hold harmless WSDOT, its officers, agents, and employees from and against any and all claims, suits, losses, damages or costs, including reasonable attorney's fees, arising from the use of outdated design file drawings, and such indemnification shall survive acceptance of said file(s) by receiver.
Special fonts are required for these drawings. Details are provided in the download and installation instructions.
Bridge design drawings
Chapter 8 - Walls & Buried Structures
Chapter 9 - Bearings & Expansion Joints
Chapter 10 - Sign, Barriers, Approach Slabs and Utilities
Chapter 8 - Walls & Buried Structures
Structural Earth Walls
8.1-A2-1 SEW Wall Elevation (PDF 50KB) (DWG 36KB)
8.1-A2-2 SEW Wall Section (PDF 90KB) (DWG 51KB)
Tie Back Walls
8.1-A3-1 Soldier Pile/Tieback Wall Elevation (PDF 61KB) (DWG 44KB)
8.1-A3-2 Soldier Pile/Tieback Walls Details A (PDF 194KB) (DWG 200KB)
8.1-A3-3 Soldier Pile/Tieback Walls Details B (PDF 200KB) (DWG 210KB)
8.1-A3-4 Soldier Pile/Tieback Walls Details (PDF 144KB) (DWG 146KB)
8.1-A3-5 Soldier Pile/Tieback Walls Fascia Panel Details (PDF 127KB) (DWG 136KB)
8.1-A3-6 Soldier Pile/Tieback Wall Perm Ground Anchor Details (PDF 153KB) (DWG 128KB)
Soil Nail Wall
8.1-A4-1 Soil Nail Wall Elevation (PDF 75KB) (DWG 81KB)
8.1-A4-2 Soil Nail Wall Typical Section (PDF 103KB) (DWG 115KB)
8.1-A4-3 Soil Nail Wall Fascia Epoxy Coated (PDF 85KB) (DWG 60KB)
8.1-A4-4 Soil Nail Wall Fascia Encapsulated (PDF 111KB) (DWG 96KB)
Noise Barrier
8.1-A5-1 Noise Barrier on Bridge (PDF 48KB) (DWG 39KB)
Cable Fence
8.1-A6-3 Cable Fence Details 1 of 3 (PDF 74KB) (DWG 68KB)
8.1-A6-4 Cable Fence Details 2 of 3 (PDF 74KB) (DWG 68KB)
8.1-A6-5 Cable Fence Details 3 of 3 (PDF 166KB) (DWG 160KB)
Buried Structures
8.3-A1-1 Geometrics Table (PDF 74KB) (DWG 68KB)
8.3-A1-2 Split Box and Three-Sided Structure General Notes (PDF 94KB) (DWG 228KB)
8.3-A1-3 Split Box General Load Combinations (PDF 80KB) (DWG 78KB)
8.3-A1-4 Three-Sided Structure General Load Combinations (PDF 80KB) (DWG 78KB)
Split Boxes
8.3-A2-1 Split Box SB20 - SB25 Series (PDF 74KB) (DWG 68KB)
8.3-A2-2 Split Box Segment Layout Plan and Elevation (PDF 82KB) (DWG 78KB)
8.3-A2-3 Split Box Typical Section (PDF 803KB) (DWG 91KB)
8.3-A2-4 Split Box ~ Slab Typical Section (PDF 107KB) (DWG 235KB)
8.3-A2-5 Split Box Unit Geometric Details (PDF 68KB) (DWG 75KB)
8.3-A2-6 Split Box Unit Reinforcement Details (PDF 68KB) (DWG 76KB)
8.3-A2-7 Split Box Joint Sealing Details (PDF 88KB) (DWG 67KB)
8.3-A2-8 Split Box Tie Plate Connection Details (PDF 74KB) (DWG 68KB)
Three-Sided Structures
8.3-A3-1 Three-sided FC20 - FC40 Series (PDF 74KB) (DWG 68KB)
8.3-A3-2 Three-sided VC45 - VC50 Series (PDF 74KB) (DWG 68KB)
8.3-A3-3 Three-sided VC55 - VC60 Series (PDF 74KB) (DWG 68KB)
8.3-A3-4 Three-Sided Foundation Connection Joint Details (PDF 78KB) (DWG 81KB)
8.3-A3-5 Three-Sided Longitudinal Joint Details (PDF 68KB) (DWG 88KB)
Design Examples
8.3-A4-1 Split Box Buried Structure (PDF 254KB)
8.3-A4-2 Three-Sided Buried Structure (PDF 275KB)
8.3-A4-3 Soil Interaction (Racking) Analysis (PDF 275KB)
Chapter 9 - Expansion Joints
9.1-A1-1 Compression Seal (PDF 131KB)(DWG 132KB)
9.1-A2-1 Expansion Joint Details Strip Seal (PDF 169KB) (DWG 199KB)
9.1-A3-1 Silicone Seal (PDF 107KB)(DWG 104KB)
Chapter 10 - Sign, Barrier, Approach Slabs and Utilities
Sign Structures
10.1-A1-1 Monotube Sign Bridge Layout (PDF 59KB) (DWG 63KB)
10.1-A1-2 Monotube Sign Bridge Details 1 (PDF 61KB) (DWG 64KB)
10.1-A1-3 Monotube Sign Bridge Details 2 (PDF 99KB) (DWG 80KB)
10.1-A2-1 Monotube Cantilever Layout (PDF 48KB) (DWG 33KB)
10.1-A2-2 Monotube Cantilever Details 1 (PDF 97KB) (DWG 76KB)
10.1-A2-3 Monotube Cantilever Details 2 (PDF 54KB) (DWG 45KB)
10.1-A3-1 Monotube Balanced Cantilever Layout Details (PDF 74KB) (DWG 68KB)
10.1-A3-2 Monotube Balanced Cantilever Details 1 (PDF 81KB) (DWG 7 4KB)
10.1-A3-3 Monotube Balanced Cantilever Details 2 (PDF 67KB) (DWG 56KB)
10.1-A4-1 Monotube Sign Structure Foundation Type 1, 1 of 2 (PDF 107KB) (DWG 81KB)
10.1-A4-2 Monotube Sign Structure Foundation Type 1, 2 of 2 (PDF 132KB) (DWG 100KB)
10.1-A4-3 Monotube Sign Structure Foundation Types 2 & 3 (PDF 85KB) (DWG 133KB)
10.1-A5-1 General Notes (PDF 104KB) (DWG 75KB)
10.1-A5-2 Monotube Sign Structures Common Details (PDF 108KB) (DWG 94KB)
10.1-A5-3 Monotube Sign Structure Single Slope Traffic Barrier Shape Cap (PDF 104KB) (DWG 75KB)
Bridge Mounted Sign Bracket
10.1-A6-1 Bridge Mounted Sign Bracket No. 1 - Layout (PDF 69KB) (DWG 97KB)
10.1-A6-2 Bridge Mounted Sign Bracket No. 1 - Geometry (PDF 69KB) (DWG 97KB)
10.1-A6-3 Bridge Mounted Sign Bracket Details 1 of 3 (PDF 116KB) (DWG 123KB)
10.1-A6-4 Bridge Mounted Sign Bracket Details 2 of 3 (PDF 109KB) (DWG 84KB)
10.1-A6-4a Bridge Mounted Sign Bracket Details 2 of 3 (PDF 75KB) (DWG 84KB)
10.1-A6-4b Bridge Mounted Sign Bracket Details 2 of 3 (PDF 92KB) (DWG 86KB)
10.1-A6-4c Bridge Mounted Sign Bracket Details 2 of 3 (PDF 99KB) (DWG 73KB)
10.1-A6-5 Bridge Mounted Sign Brackets (PDF 142KB) (DWG 214KB)
Traffic Barriers
10.2-A1-1 Shape F Traffic Barrier Detail 1 of 3 (PDF 86KB) (DWG 84KB)
10.2-A1-2 Shape F Traffic Barrier Detail 2 of 3 (PDF 80KB) (DWG 71KB)
10.2-A1-3 Shape F Traffic Barrier Detail 3 of 3 (PDF 92KB) (DWG 136KB)
10.2-A2-1 Shape F Traffic Barrier on Flat Slab Details 1 of 3 (PDF 137KB) (DWG 291KB)
10.2-A2-2 Shape F Traffic Barrier on Flat Slab Details 2 of 3 (PDF 129KB) (DWG 151KB)
10.2-A2-3 Shape F Traffic Barrier on Flat Slab Details 3 of 3 (PDF 157KB) (DWG 305KB)
10.2-A3-1 Single Slope Traffic Barrier Details 1 of 3 (PDF 92KB) (DWG 80KB)
10.2-A3-2 Single Slope Traffic Barrier Details 2 of 3 (PDF 86KB) (DWG 65KB)
10.2-A3-3 Single Slope Traffic Barrier Details 3 of 3 (PDF 94KB) (DWG 136KB)
10.2-A4-1 Pedestrian Barrier Details, 1 of 3 (PDF 91KB) (DWG 75KB)
10.2-A4-2 Pedestrian Barrier Details, 2 of 3 (PDF 75KB) (DWG 74KB)
10.2-A4-3 Pedestrian Barrier Details, 3 of 3 (PDF 91KB) (DWG 133KB)
10.2-A5-1A Traffic Barrier Shape F 42, TL4 1 of 3 (PDF 99KB) (DWG 97KB)
10.2-A5-1B Traffic Barrier Shape F 42, TL5 1 of 3 (PDF 99KB) (DWG 97KB)
10.2-A5-2 Traffic Barrier Shape F 42, 2 of 3 (PDF 95KB) (DWG 83KB)
10.2-A5-3 Traffic Barrier Shape F 42, 3 of 3 (PDF 94KB) (DWG 139KB)
10.2-A6-1A Traffic Barrier - Single Slope 42 TL4 1 of 3 (PDF 149KB) (DWG 215KB)
10.2-A6-1B Traffic Barrier - Single Slope 42 TL5 1 of 3 (PDF 89KB) (DWG 75KB)
10.2-A6-2A Traffic Barrier - Single Slope 42 2 of 3 (PDF 89KB) (DWG 66KB)
10.2-A6-3 Traffic Barrier - Single Slope 42 3 of 3 (PDF 95KB) (DWG 134KB)
Luminaire
10.2-A7-1 Luminaire on F Shape Traffic Barrier (PDF 169KB) (DWG 200KB)
10.2-A7-2 Luminaire on Single Slope Traffic Barrier (PDF 167KB) (DWG 470KB)
Rail Retrofits
10.4-A1-1 Thrie Beam Retrofit Concrete Baluster (PDF 67KB) (DWG 191KB)
10.4-A1-2 Thrie Beam Retrofit Concrete Railbase (PDF 56KB) (DWG 84KB)
10.4-A1-3 Thrie Beam Retrofit Concrete Curb (PDF 57KB) (DWG 250KB)
10.4-A1-4 WP Thrie Beam Retrofit SL1 - Details 1 of 2 (PDF 61KB) (DWG 75KB)
10.4-A1-5 WP Thrie Beam Retrofit SL1 - Details 2 of 2 (PDF 61KB) (DWG 78KB)
10.4-A2-1 TB Shape F Rehab - Details 1 of 3 (PDF 107KB) (DWG 100KB)
10.4-A2-2 TB Shape F Rehab - Details 2 of 3 (PDF 127KB) (DWG 157KB)
10.4-A2-3 TB Shape F Rehab - Details 3 of 3 (PDF 158KB) (DWG 172KB)
Railings
10.5-A1-1 Bridge Railing Type Pedestrian Details 1 of 2 (PDF 67KB) (DWG 58KB)
10.5-A1-2 Bridge Railing Type Pedestrian Details 2 of 2 (PDF 81KB) (DWG 75KB)
10.5-A2-1 Bridge Pedestrian Railing Type BP Details 1 of 2 (PDF 67KB) (DWG 60KB)
10.5-A2-2 Bridge Pedestrian Railing Type BP Details 2 of 2 (PDF 81KB) (DWG 75KB)
10.5-A3-1 Pedestrian Railing Type BP-Steel Details 1 of 2 (PDF 86KB) (DWG 106KB)
10.5-A3-2 Pedestrian Railing Type BP-Steel Details 2 of 2 (PDF 120KB) (DWG 157KB)
10.5-A4-1 Pedestrian Railing Details 1 of 2 (PDF 103KB) (DWG 126KB)
10.5-A4-2 Pedestrian Railing Details 2 of 2 (PDF 108KB) (DWG 121KB)
10.5-A5-2 Bridge Railing Type Snow Fence Details 1 of 2 (PDF 122KB) (DWG 64KB)
10.5-A5-3 Bridge Railing Type Snow Fence Details 2 of 2 (PDF 131KB) (DWG 63KB)
10.5-A5-4 Bridge Railing Type Chain Link Fence (PDF 97KB) (DWG 62KB)
10.5-A6-1 Bridge Railing Type BP-12 Details 1 of 2 (PDF 106KB) (DWG 53KB)
10.5-A6-2 Bridge Railing Type BP-12 Details 2 of 2 (PDF 104KB) (DWG 51KB)
10.5-A7-1 Bridge Railing Type S-BP-12 Details 1 of 2 (PDF 88KB) (DWG 43KB)
10.5-A7-2 Bridge Railing Type S-BP-12 Details 2 of 2 (PDF 119KB) (DWG 64KB)
Approach Slabs
10.6-A1-1 Approach Slab Detail 1 of 3 (PDF 125KB) (DWG 113KB)
10.6-A1-2 Approach Slab Detail 2 of 3 (PDF 72KB) (DWG 132KB)
10.6-A1-3 Approach Slab Detail 3 of 3 (PDF 147KB) (DWG 238KB)
10.6-A2-1 Concrete Pavement Seat Repair (PDF 98KB) (DWG 103KB)
10.6-A2-2 T-Section Pavement Seat Repair (PDF 97KB) (DWG 106KB)
Utility Hangers
10.8-A1-1 Utility Hanger Details 1 of 2 (PDF 120KB) (DWG 192KB)
10.8-A1-2 Utility Hanger Details 2 of 2 (PDF 94KB) (DWG 150KB)
10.9-A1-1 Guide to Utility Hanger Details (PDF 97KB) (DWG 132KB)
Bridge Drains
10.11-A1-1 Bridge Drain Modification (PDF 72KB) (DWG 94KB)
10.11-A1-2 Bridge Drain Type 2 thru 5 (PDF 72KB) (DWG 94KB)
