A challenge by a traditional owner to the Aboriginal heritage approval given for the controversial Roe 8 highway extension through southern Perth has been dismissed by a Supreme Court judge.

The custodian from Whadjuk Noongar country, Corina Abraham, lodged the challenge arguing the WA Government failed to follow procedural fairness in permitting the disturbance of a highly significant mythological site at the Beeliar Wetlands.

The Aboriginal Cultural Materials Committee (ACMA) recommended in February 2013 that an application to disturb registered sites to make way for the extension be rejected because of the spiritual significance of Bibra and North lakes.

But mid last year, ACMA reconsidered the application and recommended it be approved.

Ms Abraham said she was disappointed with the decision of Supreme Court Justice Janine Pritchard to dismiss her challenge, but has vowed to keep fighting.

"It just shows me that our State Government of Western Australia, Barnett's Government, has and shows clearly a lack of respect in regards to the cultural significance we have as Aboriginal people to our country," she said.

"The decision, it won't stop me from fighting, it just clearly shows that we've got to look at all angles, at all avenues, and please we need support from community, we need support from our Aboriginal people."

Ms Abraham said she would consider appealing the decision.

She was represented by barrister Greg McIntyre, who represented Eddie Mabo in the historic 1992 native title case.

Roe 8 is the first stage and a key part of the $1.6 billion Perth Freight Link project, which seeks to build a byway for heavy haulage from Perth's eastern industrial suburbs through to Fremantle Port.