B09_Att_02_GLCA_Bathymetry_Info_0001.docx
DOCX document 23 KB Posted
- Attached to
- GLCA 210865 Replace Wahweap Government Dock DB Federal contract opportunity
- Solicitation number
- 140P2026R0030
About this file
This is a technical data documentation file describing bathymetric survey information for the Glen Canyon National Recreation Area (GLCA). The file provides background on two distinct bathymetry datasets for Lake Powell, located on the Utah-Arizona border. The 2017 Wood's Hole dataset represents the more recent and accurate source, produced through raster-to-vector contour conversions at 2-meter resolution, covering depths between approximately 3,104 and 3,622 feet. This dataset is derived from high-resolution geophysical data collected under U.S. Geological Survey Field Activity 2017-049-FA, with detailed source data and methodology available through the ScienceBase-Catalog.
The GLCA 1983 Bathymetry dataset is the secondary source identified in the file, though it lacks associated metadata and documented sources. The origin of this dataset is unclear, though it may have been digitized from existing Bureau of Reclamation pre-dam drawings that are archived on CDs and DVDs available through previous GLCA staff. While the 1983 dataset is noted as less accurate than the 2017 data, it provides broader geographic coverage extending to the full 3,622-foot depth range. The file indicates that Jacobs (the apparent contractor or consultant) may request access to the pre-dam drawings if needed for project purposes.
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Text version
The 2017 Wood’s Hole data is a product of raster to vector contour conversions at 2meter resolution. It covers approximately 3104’-3622’ depths. Please see High-resolution geophysical data collected in Lake Powell, Utah-Arizona, U.S. Geological Survey Field Activity 2017-049-FA - ScienceBase-Catalog for source data and methodology.
The GLCA 1983 Bathymetry data does not have any associated metadata. The sources used are unknown. There are existing BOR pre-dam (pre-lake) drawings that are rectified on archived GLCA CDs and DVDs from previous staff that is available if Jacobs would like it. Digitizing these contours may be the source of this bathymetry data, or they may have been obtained from other sources. This data source is less accurate but covers a larger area (up to 3622’) than the 2017 bathymetry data.
File details come from the government source that posted it. Updated .