Investment and a strategic plan is required to secure the future of the Wirrina Cove marina, according to Member for Mayo Rebekha Sharkie.
This follows a lengthy court battle regarding an unpaid $250,000 dredging bill, which recently resulted in the state government taking control of the facility.
Marina St Vincent operator Stephen Marks and his company New Wave Aerospace (NWA) were evicted from the marina in March, but concerns remain that infrastructure (including pontoons) will be removed from the site.
Ms Sharkie said she was concerned NWA would remove pontoons and other infrastructure, leaving the facility unusable and neglected for a significant period of time.
"The state government has been kicking the can down the road for decades when it comes to this site," Ms Sharkie said.
"They need a strategic plan and they need to commit to investing in this marina which is the only facility of its type on the Fleurieu."
Ms Sharkie who is a regular user of the marina, said it has been particularly busy of late.
As a keen fisher, Ms Sharkie said last weekend the site was packed, which highlights its significance to the region.
"If you want a berth, you have to head north to Holdfast Shores or North Haven. In terms of a full service boat ramp, the next one heading south on the Fleurieu is Cape Jervis and I know I have been advocating on behalf of residents keen to see promised upgrades at this site completed," Ms Sharkie said.
"If the state government is serious about supporting recreational fishers and regional tourism, they actually need to invest money into Wirrina. It would be money well spent.
"As a boatie myself I have used this facility and it has so much potential. It's such a beautiful part of South Australia.
"Ideally, I would like the state government to invest in the site so it has adequate fuelling and launch facilities (maybe even another launch), more organised parking, security gates and perhaps a kiosk. This will make the marina more practical and attractive to boaties and boost visitation to this area."
Minister for Transport, Infrastructure and Local Government Stephan Knoll's office did not respond when questioned for comment.