A spline of a steel-rod safety fence (to keep out sharks) topped by a timber-plank walkway.
Usually such baths were formed by a 3-sided fence, 2 sides extending from the river shore in parallel out into the saltwater estuary, with a 3rd side joining the watery ends of the other two.
A 6ft-wide wood-plank walkway, with an outside handrail, mounts on timber transoms supported above water by timber piers. Steel rods form a vertical grill between adjacent outside piers.
The baths perimeter can be constructed by using sibling asset 'estuarine swimming baths, fence and walkway perimeter spline with corner endcap' <kuid:368725:30112> to run from the shore to the first corner, then again to run from the first corner to the second corner. Finally use this asset to run from the second corner back to the shore.
If required, attach 'stair at 45 degrees from boat jetty up to bank top' <kuid:368725:20411> to link the walkway level with higher shore ground.