Archeological Observations North of the Rio Colorado

Archeological Observations North of the Rio Colorado was originally published in 1926 as part of the Smithsonian Institution's Bureau of American Ethnology Bulletin 82. It contains the report of six seasons of fieldwork for the bureau undertaken by Neil M. Judd between 1915 and 1920 in western Utah and northwestern Arizona.

The original investigation set out to examine Pueblo-like sites near Beaver, Utah. This led to a much larger project, as there were many more archaeological sites than expected and these were recognized as having a cultural affinity with other prehistoric Puebloan sites. During these six years, Judd's team covered a region from the Grand Canyon to the north shore of the Great Salt Lake, east to the Green River, and west into the deserts of Nevada.