We recently happened upon some aerial images of the lower Colorado River that were taken in 1930. That is kind of a big deal. They were taken before the construction of Hoover Dam, so these photos are the only aerial images we have of what this awesome river and its floodplain looked like before the streamflow became heavily regulated. This quick and not fully 1:1 comparison shows the river in the Great Colorado Valley / Palo Verde Valley on the border of Arizona and California. Blythe, CA is just off the top of the image. The floodplain is about 11 miles wide at its widest point in these pictures.Yes, there will be orthorectification and mapping of these. We have a full set from 1938 that shows the river having already undergone a dramatic and rapid geomorphic response to the final construction of the dam between 1931 and 1936. Mapping it will be interesting, but nothing could possibly match seeing the mighty, snowmelt-laden Colorado River coursing through this impossibly hot desert valley in the late spring...back in the day.