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Agencies A-Z Online Services

Consultants & Contractors

Get resources, tools, and guidelines needed to collaborate with the Iowa DOT on a projects to build, maintain, and improve roads and infrastructure.

Services for Consultants & Contractors

  • Construction & Materials

    Guidance on methods, materials, and compliance, ensuring your project meets all contract requirements.

  • Contracts

    Letting information and contractor prequalification requirements.

  • Specifications

    Construction and material specifications, standard specifications, general supplemental specifications, and ERL.

  • Design

    Design manual, standard road plans, road design details, and other road design information.

  • Bridges & Structures

    Bridge design policies and standards, automation tools, bridge maintenance and inspection manuals.

  • Right of Way

    Right of way design, property appraisals, negotiations, relocations, property management, and utility coordination.

  • Traffic & Safety

    Access management, advertising, traffic engineering, sign production, and transportation safety

  • Traffic Operations

    Using technology like cameras and sensors to gather, analyze, and provide information to the traveling public.

Consultant Resources

Find more consultant and designer resources
  • Project Delivery Manual

  • Project Development Cost Estimating Manual

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  • View Open Request for Proposals (RFP)

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ERL - Electronic Reference Library

Electronic Reference Library (ERL)

ERL contains the Construction Manual, Materials IMs, Specifications, Standard Plans, and other standards.

Access Current ERL
Issue Date - April 15, 2025

Legacy ERL mobile-friendly format

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Department of Transportation

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Iowa Department of Transportation Central Office

800 Lincoln Way
Ames, IA 50010

Phone

515-239-1101

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