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Iowa's precast concrete drainage work on state projects is governed by the Iowa Department of Transportation (Iowa DOT). The requirements for drainage structures, reinforced concrete pipe, box culverts, and the concrete itself live in the Standard Specifications for Highway and Bridge Construction, Series 2023, with details carried on the state's standard drawings. Precast producers read those documents alongside the project plan set to know what to make and how it will be accepted.
This page links the core Iowa DOT documents a precast producer or estimator uses: the standard specifications, standard drawings, approved products, and where bid plans are posted. We are still documenting how Iowa DOT presents drainage structures on plan sets.
Standard Specifications for Highway and Bridge Construction, Series 2023. The sections below cover precast drainage structures, pipe, culverts, and concrete.
Section numbers are a reference. Confirm them against the current specification and any special provisions for your project.
The DR (Drainage) series includes precast concrete items such as a precast concrete headwall for subdrain outlets and concrete apron plans.
Searchable by material, producer, or Materials IM number; lists approved products, sources, producers, and suppliers for Iowa highway projects.
We are still documenting how Iowa DOT presents drainage structures on plan sets.
DhyanaERP has not built a Iowa DOT parser profile yet.
DhyanaERP Drainage Summary Import reads a plan set, finds the drainage structure sheets, transcribes them under a strict extraction contract, checks the engineering, and turns each row a person confirms into a priced structure. This status describes DhyanaERP's reading capability only. It is not a statement of DOT approval.
See DhyanaERP Precast EditionEvery link points to the agency's own site.
DhyanaTech is not affiliated with or endorsed by any state DOT.
Reference only. Not engineering or legal advice. Always confirm against the current specifications and the contract documents for your project.
Last verified November 2026.