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River Medlock

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Lower reaches

The final miles of the river flowing to the River Irwell have been extensively modified. The river is culverted underneath the car park of the City of Manchester Stadium (the site of a former gasworks). It is visible flowing through Mayfield Park and under a bridge on Baring Street, close to Piccadilly station, before running again in a culvert beneath the former University of Manchester Institute of Science & Technology campus (London Road (A6) to Princess Street), then under Hulme Street, until it appears briefly at Gloucester Street before flowing under the former gasworks at Gaythorn, reappearing at City Road East.

At the point where Deansgate and Chester Road (A56) meet (under the Bridgewater Viaduct), the river meets the Bridgewater Canal head on, where a sluice gate (a listed structure) allowed water to feed the canal, until the water quality of the Medlock became too polluted for canal use. Normally, the level of the river is several feet below the level of the canal, and the river is carried in a tunnel under the Castlefield canal basin, reappearing at Potato Wharf, where it is supplemented by excess canal water draining into a circular weir. When the river is in flood, the tunnel cannot cope and river water enters the canal, flows across the basin, and exits via the weir and manually operated gates. One-quarter mile (400 metres) further on, the Medlock enters the Irwell adjacent to the bottom gate of the disused Hulme Locks.

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