The Indian Space Research Organisation (ISRO) conducted a rapid damage assessment of the devastating flash floods in Dharali village, Uttarkashi, Uttarakhand, which occurred on August 5, 2025. Using high-resolution imagery from its Cartosat-2S satellite captured on August 7, ISRO revealed a large fan-shaped deposit of sediment and debris spanning about 20 hectares at the confluence of the Kheer Gad and Bhagirathi rivers. The satellite images highlight extensive alterations in river morphology, including widened stream channels and changed river courses. Several buildings in Dharali were either completely destroyed, submerged under mud and debris, or swept away, with about 70% of structures in the hardest-hit areas affected. ISRO’s comparative analysis with pre-event images from June 2024 provides vital data to guide ongoing search and rescue operations and restore connectivity to the isolated region. This rapid satellite mapping underscores the increasing vulnerability of Himalayan settlements to natural disasters and supports scientific efforts to ascertain the precise causes, which include theories of glacial lake outburst floods and reactivated landslides exacerbated by climate change. These findings are critical to improving disaster risk management and resilience in the fragile Himalayan ecosystem.