From the WFAA report

White Rock Creek ran green yesterday afternoon near Medical City Hospital and no, it wasn’t a St. Patrick’s Day prank. Investigators identified the bright green substance as a dye that was being used to test for plumbing leaks in one of the hospital’s cooling towers.

Fortunately, the dye is entirely non-toxic. Check out the WFAA report. Pretty bizarre, no?

Click to sign up for the Advocate's weekly news digest and be the first to know what’s happening in Preston Hollow.