Bathymetric and topographic surveys of the Upper Colorado River, May 13, 2021, to July 26, 2023

Bathymetric and topographic surveys were collected along an approximately 47-kilometer reach of the Colorado River beginning at the Pumphouse Recreation site and extending downstream to the USGS streamgage located near the Colorado River Road (Catamount) bridge. The surveys were collected using real-time kinematic Global Navigation Satellite System (GNSS) receivers by USGS personnel during several time periods between May 13, 2021, through July 26, 2023, using a combination of sonar and wading techniques. The wading surveys include point data that are provided as comma-delimited text files of northing, easting, elevation, and point code. The sonar surveys include point data that are provided as comma-delimited text files of northing, easting, bed elevation, water-surface elevation, and depth. All spatial data are referenced horizontally to the North American Datum of 1983 (2011) and vertically to the North American Vertical Datum of 1988 (NAVD88). Grid coordinates are projected in Universal Transverse Mercator Zone 13 North and are represented in units of meters. Also included in this data release, are data from a topo-bathymetric lidar system flown on a small uncrewed aircraft system (sUAS) along a short reach of the Colorado River downstream of the town of McCoy, Colorado. The topo-bathymetric lidar data are provided in a LAS file with point classifications.