Description: The inventory was completed by Dr. Mary H Nichols (USDA-ARS Southwest Watershed Research Center), Michelle Cavanaugh (USDA-ARS Southwest Watershed Research Center), and Dr. Haiqing Xu (University of Arizona) using 1-meter LiDAR derived DEM hillshades where available and checked using aerial imagery. It is possible that some earthworks were missed due to structure size, topography, or other obstacles/limitations.1-meter DEM data can be sources from the USGS National Map (Elevation Products) at: https://apps.nationalmap.gov/downloader/