Construction

Find information on construction materials and construction guidance.

Construction materials

Find approved construction materials, submit new materials for approval, or review our materials evaluation and tracking programs.

Construction guidance

Find information needed to ensure compliance during the construction of a project.

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Highlights from the Gray Notebook

166,800 electric vehicle

registrations in Washington in 2023, up from 114,600 in 2022.

87 wetland compensation sites

actively monitored on 918 acres in 2023.

25,000 safe animal crossings

in the Snoqualmie Pass East Project area since 2014.