A small reservoir retained by an earth embankment dam above Port Glasgow in Inverclyde, Knocknairshill Reservoir lies below the larger Harelaw Reservoir at a height of approximately 205m (672 feet), a mile (1.75 km) southwest of the town centre. It is operated by Scottish Water for the supply of drinking-water. The reservoir supports a recreational fishery for brown trout managed by Port Glasgow Angling Club.
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