Tonkin Highway, Guildford Road to Great Eastern Highway Upgrade

Closed 14 Oct 2019

Opened 8 Oct 2019


The Commissioner of Main Roads is proposing to upgrade the section of Tonkin Highway between Guildford Road (Bayswater) and the Great Eastern Highway (Belmont).

The key components of the project are:

  • construction and operation of two new bridges over the Swan River
  • road widening, reconfiguration, and modification of existing interchanges
  • construction and operation of on/off ramps and collector distributor roads
  • connectivity of the principal shared path to and along Tonkin Highway.

The proposal area is 33.3 ha along a 150 metre wide corridor of the Tonkin Highway. Temporary dewatering will be required during bridge piling construction.

The proposal will result in clearing of:

  • up to 0.7 ha of native vegetation
  • up to 19.7 ha of suitable black cockatoo foraging habitat, 18.6 ha of which is moderate quality or below
  • up to 20.2 ha of potentially suitable black cockatoo roosting habitat
  • 88 potential black cockatoo breeding trees, three containing hollows.

Management and mitigation measures are proposed to be in place during the construction phase of this Proposal.

Why your views matter

At this initial stage of the EIA process, comment is simply sought on whether or not the EPA should assess a proposal and, if so, what level of assessment is considered appropriate.

What happens next

Following the seven day public comment period and consideration of any comments received, the EPA will decide whether or not this proposal requires environmental impact assessment and, if so, what level of assessment will be applied.

The EPA's decisions on level of assessment are released each Monday on the EPA's website.


  • All of Western Australia


  • Public


  • Seven-day comment on referrals