The Ceduna District Council does not expect the Thevenard Marine Offloading Facility to be open until early next year.
A delay in the completion of dredging operations has contributed to pushing back the October finishing date to after Christmas, as well as the awarding and completion of the final works package to install electricity and water at the site.
The council's chief executive officer Geoff Moffatt said a contract for the final package would be signed in the next fortnight.
"This is the first real delay in the completion process and the reality is, when looking from the start and the design phase, a delay of a few months is not too significant," he said.
"With any civil construction projects there will be unknowns, at this stage we are looking at the new year for a finishing date, but there is still the matter of electricity and water supply to the site."
The council is working with SA Power Networks and SA Water to supply water and power, completing that part of the process.
Maritime Constructions' other commitments in Adelaide meant the dredge equipment had to be taken away, however they will return in just under two months.
"They thought they would be done by now but had to go to fulfill other commitments," Mr Moffatt said.
"They will be back in mid-October and have four or five weeks of work to do."
Mr Moffatt said the scale of the project was unprecedented for the council, but the facility was getting ever-closer to completion.
He said a number of works at the site had already been completed for the $15-million project, including the breakwater, causeway and wharf area, with the suspended jetty being installed and the marina pontoon berths about to be installed.
Mr Moffatt said while not ideal, having spoken to potential facility users they understood the reasons for the delay.
"I spoke to potential users who want to go as soon as possible, but they know there are matters that can't be alleviated," he said.
"This is the single biggest economic development council has ever undertaken in its history, and is aimed at returning an entire industry to our area."
He said there would be no further increase of user fees, while the increase in costs amounted to about $20,000 per year more over the whole-of-life financial model.