This study aimed to examine Causes and Effects of Diminishing Water Volume in LakernChelekleka, Bishoftu, Ethiopia and Strategy for Conservation. To meet the objective of thernresearch, appropriate attention were taken to investigate the land use/cover changes, fieldrnobservation, interviews with officials and horticulture farmers. Hence, the results of the studyrnShown, extent of the land use/cover change and its effects seen on Chelekleka Lake and itsrnSwampy areas were very dramatic. That is, majority of the forest land use/covers during thern(1973-2010) in Chelekleka Lake Water Shades and its surroundings were converted to croprnland, settlement, degraded bare lands, and grass lands. This land use types covers much ofrnthe southern, western, Central and eastern parts of the Chelekleka Lake Watersheds and itsrnsurroundings. Besides, notably after 1986 land use/cover change was very tremendous andrnexhibited decline of forest lands, shrub lands, and swampy vegetation. Hence, during 1973-rn1986 deforestation and soil degradation in the Chelekleka Lake Watersheds and itsrnsurroundings was very sever, which was ultimately affected the depth of the lake. In the samernperiod majority of the forest and shrub lands in upper water course changes to grass lands,rncrop lands and bare-degraded lands, i.e., markedly, degraded bare land coverage wasrnincreased because of acute increase of agricultural lands. Moreover, the land userninvestigation data conclude the presence of a shift in land use types, for instance, agriculturalrnlands were converted to population settlements areas and crop lands in turn expand to shrubrnand uncultivable land uses. Similarly irrigated vegetations also occupied the swampy areas ofrnChelekleka Lake. These land use changes caused massive reduction of surface water coveragernand changes its shapes from deep dark blue and compacted shapes to slant shallow and lightrnblue color shapes. Generally study concludes, all the Chelekleka lake especially, The innerrnand border areas of the lake Chelekleka was dramatically changed into irrigated vegetationrnand grass lands and hence the dying of the lake was already starting from upper and expandsrnto its central areas. In addition to the challenges of land use change factors like high interestrnof Horticulture expansion, poorly planned infrastructure developments, lack of awarenessrnand poor attention from governments, and climate change/variability exacerbate the dying ofrnthe lake. On the basis of the study findings of the research the following recommendationsrnforwarded undertaking appropriate resource conservation and management approaches, bothrnthe lake and its buffer zone should be demarcated and administered by concerned bodies, thernsilt and sedimentation filled the base of the lake should be removed, appropriately designedrnditch and/or bridges to transfer the streams from upper course to the lake should bernimplemented.rnKey words: Lake Chelekleka Land use land cover change