Note that you can "click" on each
picture to see an enlarged version of the picture. Maps were
found online or scanned from old books, and then were cropped to
show the Delta area only. When available, the original map
author or surveyor and its original publication date are provided.
By using the information, you may be able to research online to find
full versions of the maps.
1935 Soil Survey by US Dept of Agriculture,
Bureau of Plant Industry (Original map is huge-we had to have it
scanned and reduced at Kinko's to post it here!)
Note regarding the above map: it was photographed on the wall
at the Yolo bypass maintenance office area, but we have not seen
that map otherwise in any other records. The date of the map
came from a white label added-no date showed on the map.
Therefore this may not be an authentic map but a planner's rendering
from the 21st century.