It is difficult to know whether this is a composite aerial view of lower San Francisquito Canyon before or after the flood of March 1928, or both before and after.
The aerial survey was conducted for the County of Los
Angeles by Fairchild Aerial Surveys with a start date of January 1, 1928, and an end date of December 31, 1928.
The center point is roughly the intersection of today's McBean Parkway and Decoro Drive.
LW3493: Download original tiff here