Bridge Design
Bridge Section
The Bridge Section develops plans, specifications, and estimates for bridges, sign structures, retaining walls, and other transportation structures. Reviewing shop drawings, falsework/formwork, and construction project support is an integral part of our mission. Bridge Section functions include reviewing consultant designs and providing assistance to the Local Highway Technical Assistance Council. The Bridge Section also performs biennial bridge inspections to insure safety for the traveling public in accordance with the National Bridge Inspection Standards (NBIS), develops repair recommendations for existing bridges, performs load ratings, and determines load postings and closings of deficient bridges. Other responsibilities include the development, implementation, and operation of the Bridge Management System to provide system-wide condition analysis and reporting to support bridge-programming decisions.
The NBI (National Bridge Inventory) which includes a complete inventory of Idaho’s bridges and conditions can be found at the following link https://www.fhwa.dot.gov/bridge/nbi/ascii.cfm
- Bridge CADD Drawings
- Organizational Chart
- Load Resistance Factor Design (LRFD) Bridge Design Manual
- Bridge Inspection Coding Guide
- ITD Bridge Hydraulics Manual – July 2021
- Idaho Manual for Bridge Evaluation (IMBE)
- Idaho Manual for Tunnel Evaluation (IMTE)
- Idaho Manual for Inspection of Structural Supports for Highway Signs, High Mast Luminaires and Traffic Signals
Please send comments, questions and suggestions to Mike.Ebright@itd.idaho.gov
Mail Address:
Idaho Transportation Department, Bridge Section
P.O. Box 7129, Boise, Idaho 83707-1129
Physical Location: 3293 Jordan Street, Boise, Idaho 83703
LRFD Bridge Manual
Load Resistance Factor Design (LRFD) Bridge Manual
0.0 General Information
0.01 Checking of Construction Drawings
0.02 Consultant Project Review
0.03 Consultant Submittal Procedure
0.04 In-house Design & Checking Procedures
0.05 Major or Unusual Bridges
0.06 Public Convenience
0.07 Type, Size and Location Report
0.08 Bridge Plans
0.09 Consultant Quality Assurance/Quality Control
0.10 PS&E Procedure
0.11 Stage Construction
0.12 Hydraulic Reports
0.13 In-House Archive Procedures
Appendix A Design Aids
2.3.2.2.2 Protection of Users
2.3.3 Clearances
2.5.2.1.1 Weathering Steel Selection Criteria
2.5.2.3 Maintainability
2.5.2.4 Approach Slabs
2.5.2.5 Utilities
2.5.2.6.2 Criteria for Deflection
2.5.2.6.3 Criteria for Span-to- Depth Ratios
2.5.3 Constructability
2.6.6 Roadway Drainage
Appendix A – Design Aids
A2.1 Bridge Deck Drain Design Procedure
A2.2 Slope Paving
A2.3 Properties & Support Spacing for PVC Pipe
A2.4 Structure Width
A2.5 Bridges over Navigable Waters
Appendix B – Standard Drawings – Go to Bridge CADD Drawings
3.4.1 Load Factors
3.5.1 Dead Load
3.6.1.1.2 Multiple Presence Factors
3.6.1.2 Design Vehicular Live Load
3.6.1.3 Application of Vehicular Live Loads
3.6.1.4.2 Fatigue Load – Frequency
3.6.1.6 Pedestrian Loads
3.6.2 Dynamic Load Allowances
3.6.5 Vehicle Collision Force
3.7.3 Stream Pressure
3.9.2.4.1 Piers Parallel to Flow
3.10.2 Seismic Hazard (Seismic Hazard Map)
3.10.5 Importance Categories
3.10.9.3 Seismic Zone 2
3.12.2.1 Temperature Range
5.4 Material Properties
5.4.3 Reinforcing Steel
5.5.4.3 Prestressed Girder Stability
5.6.1 Assumptions for Service & Fatigue Limit States
5.6.3.3 Minimum Reinforcement
5.6.4.6 Spirals, Hoops and Ties
5.6.7 Control of Cracking by Distribution of Reinforcement
5.7.3.5 Longitudinal Reinforcement
5.7.3.5.2 Deflection and Camber
5.8.2.6 Crack Control Reinforcement
5.9.2.3.1b Tension Stress
5.9.2.3.2b Tension Stress – P/T Box Girders
5.9.3 Loss of Prestress
5.9.4.4.1 Factored Bursting Resistance – Pretension Anchorage Zones
5.10.8.4.2b Mechanical Connections
5.11.3.2.1 Pile Anchorage into Pile Cap
5.11.4.1.4 Transverse Reinforcement for Confinement
5.12.3.2.5 Concrete Strength
5.12.3.3 Simple Span Prestress Girders Made Continuous
5.12.4 Diaphragms
5.14 Durability
Appendix A – Design Aids
A5.1 Rebar Areas & Spacing
A5.2 Development Length
A5.3 Lap Splice Length
A5.4 Prestressed AASHTO & Bulb-Tee Girder Properties
A5.5 Precast Prestressed Slab Properties
A5.6 Deflection and Camber
A5.7 Live Load Distribution Factor for Deck Tee Girders
A5.8 Column/Drilled Shaft Detailing Requirements
Appendix B – Standard Drawings – Go to Bridge CADD Drawings
6.6.2 Fracture
6.7.2 Dead Load Camber
6.10.3 Constructibility of Steel Bridges
6.10.3.4 Lateral Girder Rotation
6.10.6.2 Strength Limit State – Flexure
6.10.10.2 Shear Connectors – Fatigue Resistance
6.13.2.7 Threads in Shear Plane
Appendix A – Design Aids
A6.1 Lateral Girder Rotation
A6.2 Steel Girder Quantity Estimate
Appendix B – Standard Drawings – Go to Bridge CADD Drawings
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9.7.1.5 Design of Cantilever Slabs
9.7.2 Empirical Design
9.7.2.5 Reinforcement Requirements for Skewed End Zones
Appendix A – Design Aids
A9.1 Deck Thickness for Empirical Design
A9.2 Permanent Metal Deck Forms
Appendix B – Standard Drawings – Go to Bridge CADD Drawings
10.6 Design Guidlines for Spread Footings On Rock
10.7.1.2 Pile Spacing, Clearances, and Embedment
10.7.1.5 Pile Design Requirements
10.8 Drilled Shafts
Appendix A – Design Aids
A10.1 Footing Layout and Pile Notes
Appendix B – Standard Drawings – Go to Bridge CADD Drawings
11.6.1.3 Design Guidelines for Integral Abutments
11.10.11 MSE Abutments
Appendix B – Standard Drawings – Go to Bridge CADD Drawings
12.11 Design Guidelines for Pre-Cast & Cast-in-Place Stifflegs and Box Culverts
Appendix B – Standard Drawings – Go to Bridge CADD Drawings
Appendix A – Design Aids
A13.1 Standard Bridge Rail Properties
A13.2 Bridge Name Signage
Appendix B – Standard Drawings – Go to Bridge CADD Drawings
14.5 Bridge Joints
14.7.2 TFE/Stainless Steel Expansion Bearing Units
14.7.5 & 7.6 Design Guidelines for Elastomeric Bearings
Appendix A – Design Aids
A14.2 Compressive Strain Curves
A14.3 Cotton Duck Reinforced Pad
A14.4 Bearing Tabulation Table
A14.5 TFE/SS Expansion Bearing Design Procedure
A14.6 Bridge Joint Selection Criteria/Design Examples
Appendix B – Standard Drawings – Go to Bridge CADD Drawings
17.1 Detailing Practices & Plan Preparation
17.2 Situation and Layout for Highways & Waterway Crossings
17.3 Situation and Layout for Railroad Crossings
17.4 CADDS Detailing Standards
17.5 Deck Placing Sequence
Appendix A – Design Aids
A17.1 Situation & Layout for Highways/Waterway Crossings Checklist
A17.2 Design & General Notes
Appendix B – Standard Drawings – Go to Bridge CADD Drawings
Please send comments, questions and suggestions to Mike.Ebright@itd.idaho.gov
Mail Address:
Idaho Transportation Department, Bridge Section
P.O. Box 7129, Boise, Idaho 83707-1129
Physical Location: 3293 Jordan Street, Boise, Idaho 83703