Lindowan Reservoir is of the impounding variety, located 1 kilometre north of Kilcreggan. It used to be the main source of water for a nearby threshing mill.Electric Scotland - Annals of Garelochside The earthfill dam is 3 metres high, and was constructed before 1850.
See also List of reservoirs and dams in the United Kingdom
References
Sources "Argyll and Bute Council Reservoirs Act 1975 Public Register"