Bathymetry Map for Sacramento-San Joaquin Delta
This rather beautiful looking Google Maps mashup shows bathymetry data for the Sacramento-San Joaquin Delta. The map uses a colour scale to show the depth of the delta on the map.
It is possible to add a map overlay from the National Oceanic and Atmospheric Administration. The map also has a feature to draw a line across a section of the map and view an elevation chart for that section.