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Washington's precast concrete drainage work on state projects is governed by the Washington State Department of Transportation (WSDOT). The requirements for drainage structures, reinforced concrete pipe, box culverts, and the concrete itself live in the Standard Specifications for Road, Bridge, and Municipal Construction, 2027, 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 WSDOT 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 WSDOT presents drainage structures on plan sets.
Standard Specifications for Road, Bridge, and Municipal Construction, 2027. 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 WSDOT Standard Plans (M 21-01) include drainage structures such as catch basins, manholes, and inlets plus precast concrete items.
Lists precast concrete manholes, catch basins, inlets, and drywells under the drainage structure spec references.
We are still documenting how WSDOT presents drainage structures on plan sets.
DhyanaERP has not built a WSDOT 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.