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Neither the State of California, its agents, nor its employees, make any warranty, representation or guarantee, express or implied; nor assumes any liability or responsibility for the accuracy, completeness, or usefulness of this data.This Image Service was published on 02/24/2026 by Bianca Pertl of the DWR Division of Engineering, who may be contacted at 916-757-3593, or at bianca.pertl@water.ca.gov. Comments, problems, improvements, updates, or suggestions should be forwarded to the official DWR point of contact as available and appropriate.The California Department of Water Resources (CA-DWR), North Central Region Office (NCRO), Bathymetry Data Collection Section, conducted a bathymetric survey of Middle River from the conlfuence with Old River to Union Point. The main purpose of the data is to improve knowledge about water circulation and conveyance in the South Delta. The survey took place between March7th and March 13th, 2017 using multibeam echo sounder technology. The data were positionally corrected using Inertially Aided Post-Processed Kinematic (IAPPK) procedures. \u2022 Field Dates: March 7, March 8, March 9, March 13, 2017 \u2022 Survey Type: Multibeam \u2022 Data Density: 1 foot grid \u2022 Horizontal Datum: North American Datum of 1983 (NAD83) California Coordinate System (CCS83) State Plane Zone 3, US feet \u2022 Vertical Datum: North American Vertical Datum of 1988 (NAVD88) geoid 12A, US feet \u2022 Processing Epoch: 2017.197; CSRC Datum Epoch: 2010 \u2022 Related Datasets: Middle River 2011, Victoria Canal 2011, Old River 2013, Middle River South 2022, Old River @ Union Island 2022, Victoria Canal 2022, Paradise Cut 2022, Tom Paine Slough 2022, Old River 2022, Middle River South 2023, Middle River @ Undine 2024 \u2022 Involved Staff: Data collected and processed by NCRO Bathymetry and Hydrography sections \u2022 Survey Responsible Charge: Jacob Wright, PLS (CA 8717) Please see associated survey report for full control and QC check details. 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