This archived dataset was developed by DWR for its internal use. This data is not suitable for property boundary determination, construction layout, legal descriptions, or any other professional land surveying or legal purpose. The data represents estimates of past conditions and measurements, may contain errors, and is no longer representative of current conditions. 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.

The California Department of Water Resources (CA-DWR), North Central Region Office (NCRO), Bathymetry Data Collection Section, conducted a bathymetric survey of the Lake Del Valle Reservoir for the Delta Field Division of CA-DWR.• The purpose of this project is to document lake bed elevations, sediment rates, update stage/storage curves, and identify any issues with underwater structures in the Lake.• The survey took place between May 29th and June 5th, 2018 using multibeam echo sounder technology. • The data were positionally corrected using Inertially Aided Post-Processed Kinematic (IAPPK) procedures.• The data conforms with the NAD83 (California State Plane Zone III coordinate system) and NAVD88 datums. • The final density level of the multibeam data points is a 3 foot grid.