Inspection & preservation

Find information for inspecting and managing bridges and structures.

Bridge Inspection Manual

Specific guidance and technical details for bridge inspections are discussed in the Bridge Inspection Manual (M 36-64).

Bridge List

All structures for which the department has a maintenance responsibility is provided in the Bridge List (M 23-09).

Ferry Terminal Inspection Procedure Manual

Procedures for conducting structural inspections of ferry terminal facilities are provided in Ferry Terminal Inspection Procedure Manual (M 3105.05).

Transportation Structures Preservation Manual

Responsibilities for the inventory, inspection, rating, maintenance, damage repair and analysis of load carrying capacity of the transportation structures are provided in the Transportation Structures Preservation Manual (M23-11).

See all manuals and standards

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Improved access to 98.2 miles of upstream fish habitat

through 15 fish passage projects in 2021.

28% increase in the value of exports and imports 

from $90.2 billion in 2020 to $115.5 billion in 2021.