In the Yoruba tradition, Erinle is an ancient areana in Ido-Osun, this place is known to house large numbers of elephants and hippos in the old times.

[4] Malaria and diarrhea are rampant in Osogbo, particularly in the high-density residential areas where the people depend on public tap water.

[5] The old Erinle dam was completed in 1954, with a reservoir capacity of 5,300,000 cubic metres (190,000,000 cu ft).

[citation needed] Tests in June and July 2011 showed that treated water from the dam had a high presence of total coliform and was not suitable for drinking without further treatment.

[citation needed] Bacteria in the treated water were also highly resistant to commonly used antibiotics in Nigeria.

[7][full citation needed] The Erinle Dam, completed in 1989, is 330 metres (1,080 ft) above sea level.