She said the Government had recently cancelled and delayed projects including at Mill Rd, the train station and widening of the motorway near Drury where a large residential expansion is expected to be built, and the rail link to the airport.
"I see the most ridiculous decisions going on and it seems to have nothing to do with economic growth," she said.
"It's a nice-to-have."
She said a new replacement bridge that was strong and widened for vehicles, pedestrians and cyclists would "only cost $2 billion".
"How many people are seriously going to be taking their kids to school, the netball team to sport ... across the bridge."
Transport Minister Michael Wood said in a statement that geotechnical investigations and testing had found that adding a structure to the existing bridge was not possible.
"We need this transport connection to move ahead but it isn't technically possible to attach it to the existing bridge without putting the whole structure at risk.
"A stand-alone structure is the safest option that will not only provide a walking and cycling option for commuters but creates an outstanding piece of tourism infrastructure."
The bridge was expected to cost about $685 million plus another $100m for the land section of the route. About 5000 people a day were expected to use it.
The Government was planning to follow it with another harbour crossing - a tunnel for vehicles.
Auckland Mayor Phil Goff said the bridge was a sustainable, enduring project that would last for generations.
