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CASE STUDY Utilizing New Methods to Research Impacts on a Precious Waterway January 7, 2021 Share Seafloor Systems was recently contracted by the U.S. Geological Survey (USGS) to develop two custom HydroCat-180 unmanned surface vessels (USVs) that will be used to monitor the impacts of saltwater intrusion from the Pacific Ocean into the Sacramento-San Joaquin Delta in California. The subsequent research using the new autonomous vessels will provide new insights into maintaining balance within the complex ecosystem. The Sacramento-San Joaquin Delta, commonly referred to as the California Delta, is the hub of the state’s water supply system and a teeming wetland bionetwork (Figure 1). About 500 plant and animal species call the area home, making it one of the largest estuaries in western North America. Two-thirds of California’s salmon pass through the delta on their way upstream to spawn, as well as half of the state’s migratin

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