West Link Road critic John West, of Inverness Civic Trust, said the council should put the project on hold in light of the Audit Scotland report.
The lack of regular updates on the cost of the controversial project was specifically criticised by the financial watchdog.
Mr West said: “It seems a long time since I did a report to Audit Scotland drawing their attention to the matters which they have now incorporated.
“It has taken time, time which unfortunately Highland Council, have used to press forward in the face of overwhelming public opposition.
“The criticisms range across the board from the actions of the council in deliberately ignoring national guidelines, the executive for being either unaware or patronising in their assumption of power and councillors for refusing to bring the scrutiny to bear on this project.
“What is outwith the ambit of Audit Scotland is to ask why this scrutiny was absent, but the public are aware of the reason.
“So many councillors owe their continued position to the slavish adherence to party policy, that party has taken precedence over the public good.”
He said that the council officials had “ignored” requirements to review capital projects.
He added: “The trust have continually stated that the saving of the environmental assets of Inverness would be best served with a bridge or a tunnel and that a reasoned assessment of the costs and benefits of such alternatives should and must be implemented.
“The council and the executives’ dictatorial attitudes demand that this assessment is carried out by a truly independent body, which would have the confidence of the people of Inverness.”