Processed 1938 Aerial Photography for Selected Areas of the Lower Colorado River, Southwestern United States

The U.S. Geological Survey (USGS) initiated a study of the Lower Colorado River
to derive temporal-change characteristics from the predam period to the
present. In this report, we present summary information on accomplishments
under a USGS task for the Department of the Interior's Landscapes in the West
project. We discuss our preliminary results in compiling a digital database of
geospatial information on the Lower Colorado River and acquisition of data
products, and present a geospatial digital dataset of 1938 aerial photography
of the river valley. The U.S. Bureau of Reclamation (BOR)'s, Resources
Management Office in Boulder City, Nev., provided historical aerial photographs
of the river valley from the Hoover Dam to the United States-Mexican border,
with some exclusions. USGS authors scanned and mosaicked the photographs,
registered the photo mosaics, and created metadata describing each mosaic
series, all 15 of which are presented here.

[Summary provided by the USGS.]