Structure Locations

The latest structures location information can be obtained from Main Roads' Structures Web App.

Structure (bridge) heights information is available on the Oversize Overmass Permits page of this website.

Structure Definitions

Definitions for different structures are provided below to ensure the use of the appropriate inventory form and inspection form, as well as ensuring the allocation of responsibilities for managing the asset is clear.

  • Bridge: a structure (with the exception of gantries) having a clear opening in any span of greater than 3 metres measured between the faces of piers and/or abutments or structures of a lesser span with a deck supported on timber stringers. Note: A traffic-supporting structure that is a combination of bridge and culvert openings is managed as a "Bridge".

  • Precast Box Unit Bridge: a specific superstructure bridge type consisting of precast box units of clear opening in any span of greater than 3 metres.

  • Culvert: a structure under a road having only clear openings of less than or equal to 3 metres measured between the faces of piers and/or abutments or a pipe shaped structure of any diameter.

  • Gantry: an overhead structure spanning, or partially spanning (if cantilevered), a road carriageway for the specific purpose of carrying regulatory, advisory, warning, variable message sign (VMS) or directional signs.


Inventory Forms

The applicable inventory form is required for each new or refurbished structure.

The General Bridge Inventory Information Form shall be used for gantries. A combination of the details contained in the general bridge inventory form and culvert inventory form shall be used for precast box unit bridges until a new form is developed for this specific superstructure type.

The Culvert Inventory Form shall only be used when a bridge has been replaced with a culvert (as per the culvert definition above).


Inspection Guidelines 

We provide a range of inspection guidelines which can be found in the Technical Library under Structures Engineering. 


Attachment of Services to Existing Structures

Utility Providers considering attaching services to an existing or new traffic bridge, traffic structure or other road service structure must contact the Asset Manager Structures in their region in the first instance. Below is the approval procedure for attachment of services to structures. Prior to commencement of any installation, a Utility Provider Service Management Agreement is required detailing maintenance, future removal or relocation, responsibility of costs and indemnity. An example of the wording required is attached below.

Reference must also be made to the Utility Services in Road Reserves - Policy and Guidelines. 


Miscellaneous Asset Management Documents

An aluminium alloy plate is to be attached to each timber bridge at abutment 1 LHS and filled in after every termite inspection/treatment.

Termite Inspection Plate (PDF 86 KB)

A bridge number tag is to be added to each bridge crossing sign at both abutments for ease of identification purposes.

Bridge Number Tag (1 Page - PDF 100KB)

These Standards describe maintenance actions aimed to have a sustained beneficial effect of extending the life of timber structures when undertaken in a regular and systematic manner.

Timber Bridge Preventive Maintenance Standards (77 pages - PDF 1.54MB)

Acknowledgement of country

The Government of Western Australia acknowledges the traditional custodians throughout Western Australia and their continuing connection to the land, waters and community. We pay our respects to all members of the Aboriginal communities and their cultures; and to Elders both past and present.

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