<p>Landslide dams are widely occurring geological disasters. When a river is obstructed by the collapse of slopes, a landslide, debris flow, or other forms of mass movement, landslide dams are formed. Damage to these dams may cause a severe flood disaster downstream. Most landslide dams are formed in remote mountains, leading to the difficulty of performing on-site surveys and stability assessments. Hence, data can only be collected on landslide dams through satellite images or drone photography. This increases the difficulty of assessing the dam failure type and dam stability, posing a challenge to the prevention and mitigation of landslide dam disasters. To overcome these challenges, this study proposes a method for the remote survey and stability assessment of inaccessible landslide dams that involves the use of multi-period satellite images, helicopter surveys, drone photography, and downstream water level monitoring. The remote stability assessment and evaluation of downstream water levels enable the long-term monitoring of landslide dams formed from two or more collapses of river slopes at the same location within a short duration as well as a rolling review of dam stability. The proposed method was applied for conducting a case study of the Danan River landslide dam located in the eastern mountains of Taiwan in 2021. The dam was damaged three times; this process was recorded in its entirety to provide a reference for formulating innovative disaster prevention and mitigation measures for landslide dams.</p>