Calls are intensifying for major work to be done on the St Helens barway after another boat capsized trying to cross it.

A couple from Turners Marsh had to be rescued when their aluminium runabout was swamped by waves on Saturday afternoon.

Neither were seriously injured.

Three fishermen had to be rescued from the barway when their boat capsized about a month ago and charter operators say they have had to cancel trips over the summer because the water was too shallow to cross.

Locals want the barway dredged but Justin Foster from Marine and Safety Tasmania said that was not a straightforward option.

"Trying to find a dredge that can actually work in those sort of hostile conditions is quite difficult," he said.

"Certainly approvals do add another level of complexity. Not only do we need to find a suitable vessel but we need to be able to find somewhere to dispose of the sand."

Instead, MAST is doing work with a coastal engineer to increase the depth of Pelican Point, a navigational channel inside Georges Bay.

Mr Foster said previous efforts to remove sand from inside the bay had been undone by storm events and more permanent solutions were now being canvassed.

"Such as a wall or some groynes that will help direct the water flow and help the channel to scour itself and remain at a consistently even depth," Mr Foster said.

But fishing charter operator Rocky Carosi said it was the St Helens barway that really needed attention.

"The number of near misses that have happened, that's the serious concern," he said.

The view is supported by John McGiveron from the St Helens Barway Committee.

"I think the simple answer is it's easy," he said.

"It's sheltered water, it's inside the bay and it's probably achievable. The barway's more difficult but by the same token it has to be addressed."

The State Government will submit a report to St Helens residents on the options for Pelican Point.