This thirty-six box collection contains the papers of the Union and Jordan Irrigation Company. These papers span the period of 1873 to 1980 and consist of meeting minutes, correspondence, legal papers, financial papers, blueprints, reports, and other similar papers. The materials in this collection document the entire life span of the Union and Jordan Irrigation Company, a near one-hundred-year period of irrigation evolution.

At the time this collection was donated, most of its original order had become jumbled. A preliminary attempt to process the collection took place after its initial donation. A final, more detailed processing took place in 2003. At that time, an attempt was made to preserve whatever remnant of original order that still existed while placing related segments of the collection together. The materials in this collection have been organized into seven series.