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Kesses Dam (or Lake Lessos) is a small man-made lake in Kenya. It is one of the sources of the Yala River. It is used as a source of water for irrigation and domestic use, and also for boating and other water activities.
Kesses Dam is in Kesses Sub County of Uasin Gishu County, on a plateau in Rift Valley. The climate is cool and temperate.The area has level terrain with medium gradient hills with shallow depressions. There are wetlands and small permanent streams.
Kesses Dam is 31 kilometres (19 mi) south of Eldoret town and 6 kilometres (3.7 mi) east of the main campus of Moi University, at an elevation of 2,750 metres (9,020 ft). It receives most of its water from the Tarakwa and Nderugut rivers, which enter the reservoir from the east through a swamp of Typha latifolia and Cyperus species. The catchment area is about 1,720 hectares (4,300 acres). As of 2012 the reservoir had an area of 189 hectares (470 acres). The average depth is 3 metres (9.8 ft). The outlet is the Sambul River to the west. The reservoir is one of the Yala River's main sources.