The Saguling Dam reservoir catchment in the upper Citarum River located in the western part of Java Island, Indonesia, has experienced significant changes in land use over the past 30 years. The forest cover has been decreased by more than half, replaced by croplands and plantations. The major sediment sources to the Saguling Dam reservoir are identified as soil erosion on steep-slope cultivated areas, landslides caused by road construction, and sediment transported from valley slopes with high connectivity. The problem can be addressed through soil conservation measures and the implementation of sediment-blocking devices, such as contour farming, field borders, and filter strips. While the low sediment connectivity in gentle urban river reaches is limited to the dry season, it is expected to increase during periods of heavy rainfall as blockage factors become ineffective. Based on on-site investigations in an area with limited data, this study can provide valuable information for formulating measures to address the sedimentation problem in the data-deficient catchment.