The assessment of the dynamics of major dams (Ede-Erinle and Eko-Ende reservoirs) in Osun State, Nigeria was investigated using Landsat-TM (1986) and Landsat-ETM+ (2002). The images were processed, interpreted and classified using ILWIS 3.3 software. The results of the study showed a sharp decline in the surface area of the study reservoirs as indicated by per cent of reduction from 1986 to 37.49 and 45.42% in 2002 for Ede-Erinle and Eko-Ende, respectively. In the light of the above, to prolong the lifespan of the study dams, there is need to carry to evacuate the hydrophytes which have colonized the edges of the study reservoirs / dam. Also, to ascertain the current volume of water in the dams, bathymetric survey of the impounded reservoirs should be carried out.
Key words: Assessment, Dam, LANDSAT TM and ETM+, Osun State.
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