Doc O i don't know how often it gets that bad, probably very rarely.

but at the properties very close to the river, the water gets murky, not necessarily any bad odor, but a funky color, murky and cloudy - with some regularity. i stayed at Trav's for about 10 days, and on about 3-4 of those days the sea water wasn't nice. it's a naturally occuring thing, i don't think there's anything 'wrong' with the water, it's just the natural interface between river and sea. but to me, it's not appealing to swim in when it gets like that.