(Adds quote from resident)
May 3 (Reuters) - An oil spill was discovered in the Red Run River in Macomb County, Michigan, CBS Detroit's website reported on Friday.
Police confirmed the spill in the area of 14 Mile and Hoover roads, the report said, citing witnesses who saw a black sheen on the water. The source of the spill was not immediately known.
"It's not a normal, change your car oil over the sewer drain. This is a serious amount of oil in this river," resident Mike Rogers told CBS Detroit.
"As far as I can see - 50 feet wide - the whole top is covered in oil. There is oil slick across the whole thing."
The city water department will seek to determine whether there has been any environmental impact, the report added. (Reporting by Naveen Arul in Bangalore; Editing by Jeffrey Benkoe)