The Rock River is a 6.1-mile-long (9.8 km) stream in Baraga County on the Upper Peninsula of Michigan in the United States.[1] It rises at the outlet of Worm Lake, east of Covington, and flows northwest.[2] It eventually empties into the Sturgeon River which continues west, then north to Portage Lake and Lake Superior. The Rock River descends 350 feet (110 m) over its 6-mile (10 km) course, for an average rate of 58 feet per mile.