The River Medlock in Greater Manchester, England rises in east Oldham and flows south and west for 10 miles to join the River Irwell in Manchester city centre. Rising in the hills that surround Strinesdale just to the eastern side of Oldham MBC, the Medlock flows through the steep-sided wooded gorge that separates Lees from Ashton-under-Lyne and the Daisy No…The River Medlock in Greater Manchester, England rises in east Oldham and flows south and west for 10 miles to join the River Irwell in Manchester city centre. Rising in the hills that surround Strinesdale just to the eastern side of Oldham MBC, the Medlock flows through the steep-sided wooded gorge that separates Lees from Ashton-under-Lyne and the Daisy Nook Country Park with its 19th century aqueduct carrying the disused Hollinwood Branch Canal over the shallow river.