Authorities are advising people to stay away from the Benoni dam after a section of the retainer wall caved in this week.
Ekurhuleni mayor Mzwandile Masina says it will cost millions to repair.
The collapse at Middle Lake Dam has put the entire structure at risk.
The municipality has pledged to repair the dam within the next four months despite the cost not being included in the current municipal budget.
Source: eNCA
