The gates at Bawsey Pits, where a man and teenager drowned last summer, will remain locked despite fears over dangerous parking.
Sibelco, the site owner, shut the car park after the double tragedy, but people are continuing to visit the beauty-spot in their cars.
Tony Crane, Leziatte Parish Council vice chairman, said: “Keeping the gates locked is not stopping people using the site but is leading to problems with poor parking.”
The decision to keep the gates locked complied with a vote at a public meeting held over the future of the site at Leziate Primary School, on Wednesday.
Swimming at the former sand quarry is banned due to serious dangers, but the site is open to the public to visit in line with planning conditions.
Gary Stringer, Sibelco’s resources director, said a formal public consultation will be held in the near future to help decide the future of the site.
He said the solution needed to have public support and would probably have a “commercial element” to it.
Ryan Pettengall, 41, of Lynn and a 16-year-old from London died at the site.