The Ohio State University has announced a restoration project for historic Mirror Lake and the surrounding areas and has begun the draining process.
From an Ohio State release:
In November 2013, the university began exploring ways to make the lake more sustainable. A series of modifications over many decades had resulted in a body of water that was both polluted and leaking, requiring consistent maintenance and creating thousands of gallons of waste water daily.
The restoration announced today will return Mirror Lake to a more natural and sustainable state — closer to its historical form — while emphasizing improved stormwater management, reducing chemical water treatments, increasing overall biodiversity, and more.