Transportation Structures Preservation Manual

Publication Number
M 23-11
Publication Version
M 23-11.01
Publication Date
Bridge & Structures Bridge Administration Section

The purpose of this document is to assign responsibilities for the inventory, inspection, rating, maintenance, and damage repair of the department’s transportation structures and for the analysis of their structural capacity to carry loads. Guidance for the department’s responsibilities in the inventory and inspection of local agency-owned bridges; and cooperative inspection, rating and maintenance of bridges between Washington and other states or agencies is also included.

8,683 animals crossed the Snoqualmie Pass East Project area

as recorded by WSDOT and partners in 2020 and 2021.

46% increase in Amtrak Cascades ridership to 251,000 passengers

in 2021 compared to 172,000 in 2020.

Nine wetland and stream mitigation sites across 32.7 acres added

to our monitoring program in 2021 to help offset climate change impacts.