Bathymetry Data for Portions of Lower Granite Reservoir and Vicinity, Washington and Idaho, 2009-10
Dates
Release Date
2017-01-01
Start Date
2009-11-16
End Date
2010-01-14
Publication Date
2023-09-15
Citation
Fosness, R.L., 2017, Bathymetry Data for Portions of Lower Granite Reservoir and Vicinity, Washington and Idaho, 2009-10: U.S. Geological Survey data release, https://doi.org/10.5066/P9PY8STF.
Summary
During autumn 2009 and winter 2010, the U.S. Geological Survey (USGS), in cooperation with the U.S. Army Corps of Engineers (USACE), conducted a hydrographic survey using a multibeam echosounder system (MBES). The survey was from river mile (RM) 130 to 142 on the Snake River, and from RM 0 to 2 on the Clearwater River areas of Lower Granite Reservoir. The survey mapped the part of the river that was accessible to the boat and the echosounder equipment, but very shallow areas along the banks that were inaccessible or too shallow to be measured with echosounder equipment were not mapped. The survey was conducted in 1-mile segments, and the data were combined to provide a continuous digital elevation dataset of the reservoir within the [...]
Summary
During autumn 2009 and winter 2010, the U.S. Geological Survey (USGS), in cooperation with the U.S. Army Corps of Engineers (USACE), conducted a hydrographic survey using a multibeam echosounder system (MBES). The survey was from river mile (RM) 130 to 142 on the Snake River, and from RM 0 to 2 on the Clearwater River areas of Lower Granite Reservoir. The survey mapped the part of the river that was accessible to the boat and the echosounder equipment, but very shallow areas along the banks that were inaccessible or too shallow to be measured with echosounder equipment were not mapped. The survey was conducted in 1-mile segments, and the data were combined to provide a continuous digital elevation dataset of the reservoir within the limitations of the project. The elevation points in the dataset were referenced to the USACE established benchmarks using the real-time kinematic-global positioning system (RTK-GPS); therefore, point elevations were unaffected by reservoir stage changes.
Preview image of the study area. Colored region is the channel floor elevation from deep (blue) to shallow (red). A distance scale shows the distance of the study area, and grid lines show the east and west extent of the project coordinate system.
These bathymetry data will be used by the USACE to develop a model that can help better understand and estimate sediment transport and deposition in the reservoir as part of its Programmatic Sediment Management Plan (U.S. Army Corps of Engineers, 2003). The digital elevation dataset also can be used to display riverbed elevation, geomorphology (scour holes, rock outcroppings), and bedforms (ripples and dunes) when viewed using a geographic data software. The survey acts as a snapshot of benthic geomorphology that can rapidly change due to reservoir stage, river discharge, and boat traffic.
Preview Image
Preview image of the study area. Colored region is the channel floor elevation from deep (blue) to shallow (red). A distance scale shows the distance of the study area, and grid lines show the east and west extent of the project coordinate system.