The 2021/22 season at the Millicent Swimming Lake lasted longer than the customary five months.
It has been the usual practice of Wattle Range Council to have the free facility available to the public between November 1 and March 31.
Council had announced a month-long extension but then had to close it last week.
“Unfortunately, we have had to close the Millicent Swimming Lake to the public a few days earlier than promised,” council chief executive Ben Gower said.
“We were pleased to be able to extend the swim season at both the Penola Pool and the Millicent Swimming Lake, but the resources used to treat the lake’s water did not quite last the full four weeks.”
Millicent had an unusually warm and dry month of April.