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Forest harvesting activities can have significant impact on watershed hydrological processes and water quality. Sedimentation due to forest harvesting has been identified as one of the major threat to Upper Pearl River Watershed (UPRW) located in east central Mississippi. The overall objective of this study was to evaluate the impact of forest harvesting, particularly clear cutting and thinning, on hydrological and water quality characteristics at UPRW. The Soil and Water Assessment Tool (SWAT) model was used to assess hydrologic impacts such as flow, surface runoff and water yields, and water quality effect such as sediment yield.