PENRITH councillor Maurice Girotto has a bee in his bonnet over the causeway on Stony Creek Road, Shanes Park.
He says the state government should find money to upgrade the road and causeway.
"The NSW government chose as an election promise, a footbridge across the Nepean River which was needed," Cr Girotto said.
"It has since then drastically changed into an iconic bridge with a price tag of $20 million plus $4 million and in the process important pieces of infrastructure like a bridge over Stony Creek has been forgotten.
"Unfortunately we still have a very busy road which services Penrith, Blacktown and the Hawkesbury areas with a recorded 1814 creek crossing in 2014."
Hawkesbury councillor Barry Calvert agrees with Mr Girotto about the need to upgrade the road and the causeway.
"Plenty of people will be using the road once a new housing estate in Marsden Park is built," Cr Calvert said.
"People will be using the road to go across to St Marys and Penrith and if it's closed then it's a long way around for people."
Blacktown councillor Stephen Bali said the causeway was a "bombshell piece of infrastructure".
"It constantly closes. The road needs to be upgraded now," Cr Bali said.
A Roads and Maritime Services spokesman said it was up to Blacktown and Penrith councils to maintain the road and causeway.
"The NSW government provided $500,000 in 2012 to Blacktown Council to install barriers, remove hazards, widen large drains, improve floodgates and install automatic electronic signs at each end of the road to improve safety during heavy rain," he said.
"SMS technology was also installed to ensure councils and police close gates at the earliest possible time."
According to RMS, in the last 10 years there were 23 crashes and one fatality within 100 metres of the causeway.
Hawkesbury councillor Leigh Williams agreed the causeway should be upgraded because it was dangerous.
He added that he himself was nearly involved in an accident on that road.
"I was coming home one wet night and there was more water on the crossing," he said. "The water almost washed me off."
A spokesman for Penrith Council said jointly funded studies had examined a number of possible options, including building a high-level bridge.
But the bridge option was beyond the councils' financial capacity, he said.