In August 2024, the U.S. Geological Survey Idaho Water Science Center (USGS IDWSC), in cooperation with the United States Bureau of Reclamation (USBR), completed bathymetric and topographic surveys at Black Canyon Reservoir near Emmett, Idaho using a multibeam sonar and boat-mounted Light Detection and Ranging (LiDAR). The bathymetric and topographic data generally include complete data coverage from Black Canyon Dam to Black Canyon Park with sparse data coverage upstream of Black Canyon Park and data represent conditions on August 19-20, 2024 when the water surface elevation was steady at about 2,497.8 feet (Reclamation Project Vertical Datum). Prior to the bathymetric and topographic surveys, USBR completed aerial surveys using uncrewed aircraft systems to collect aerial imagery and develop elevation models using structure from motion techniques. These aerial surveys were completed on November 28-29, 2023 during a period of reservoir pool drawdown when the water surface elevation was between about 2,461 feet and 2,465.7 feet (Reclamation Project Vertical Datum). While these topographic elevation data provided high-resolution and spatially expansive coverage, the structure from motion technique does not perform well for reconstructing submerged topography. As such, IDWSC was tasked with collecting bathymetric data in areas where elevation data could not be reconstructed from aerial surveys. Collectively, bathymetric data from USGS IDWSC and topographic data from USBR may be used for further improvement of existing reservoir stage-capacity relationships of Black Canyon Reservoir.