Updated for the October 2022 letting.

Road design details aid designers in the development of detailed design plans for interstate and primary road construction in the State of Iowa. These details are not intended to cover all design situations. Typical sections and design forms may be modified for design situations requiring unique solutions. Section 1E-4 of the Design Manual provides guidance for modifying road design details.

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Revision letter (April update)   PDF file
Revision letter (October update)   PDF file
Recently published   PDF file

Renumbered Standard Road Plans and Design Details

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  Book Sections
100s Design and Tabulation Forms
200s Standard Notations
500s Design Detail Sheets
  Typical Components
  Grading Typicals
  Detour Typicals
2000s Roadway Typical Sections and Drawings
4000s Roadway Ditches
6000s Curbs
7000s Paving and Reconstruction
8000s Median Crossings, Guardrail, Barriers and Earthwork
9000s Pavement Markings