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Mississippi National River and Recreation Area (MISS) Multibeam Bathymetry, Hillshades, and Sidescan Image Mosaics; River Velocity and Bed Composition Mapping for Hidden Falls

October 12, 2021

The National Park Service's (NPS) Mississippi National River and Recreation Area (MISS) and the St. Croix National Scenic Riverway (SACN) have established high value habitat corridors for threatened and endangered native mussels, including the Winged Mapleleaf and Higgins’ Eye Pearlymussel. Underwater sonar, a hydroacoustic remote sensing technology, is a valuable tool for mapping physical habitat features in aquatic systems for sedentary biota such as freshwater mussels and has the potential to identify and quantify physical habitat features to inform management decisions. The USGS acquired high-resolution multibeam and sidescan sonar for approximately 115 kilometers of the Mississippi River, 6 kilometers of the Minnesota River, and 48 kilometers of the lower St. Croix River. Additionally, small areas of high-valued mussel habitat had additional data collected, which included acoustic Doppler current profiler (ADCP) and underwater videos — to help interpret and map physical habitat characteristics. Bathymetry in the form of a DEM (digital elevation model) will be used for depth measures.