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You will need to define your lakes as sinks (Create sink structures), and then use the ArcHydro function Adjust flow in lakes/streams/sinks. (These functions are only available in ArcHydro for ArcGIS 10.1, I have made a function that, with some modifications, might help you on the way if you are in 10.0.) You can also erase (Extract by mask) the lakes from ...


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This solution would take a lot of work, but you could use historical USGS maps to get quite detailed "bathymetry" for Lake Sakakawea. Garrison Dam was only built in the 1950s, so topographic maps from surveys before the 1950s will have the depth below water level (before any fluvial erosion or deposition). I checked on the USGS Topo website and found some 15 ...


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I would suggest contacting the Army Corps of Engineers office which manages the reservoir. They are sure to have the bathymetry in GIS-friendly format. I would hope, at the very least they have a print version that you can geo-reference and digitize the depth contours off of. (I searched through many of the ACOE management reports for a bathy map, or ...



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