A combination of Karro, Laveen, and Guest soil types are found within this area of the watershed. Karro soils are found at elevations ranging from 3,500 ft. (1,067m) to 4,000 ft. (1,220m), while Laveen soils are generally found at elevations of about 3,900 ft. (1,189m) and Guest soils are typically at elevations ranging from 3,500 ft. (1,067m) to 3,900 ft. (1,189m). All three of these soil types occur within close proximity to one another within this limited area of the watershed, so they have been lumped into one unit here.
Karro: Karro soils are deep, well-drained, and occur on alluvial fans and terraces. They formed in mixed alluvium derived from limestone, sandstone, and shale. The surface is usually barren and they occur in areas where the average annual precipitation is about 12 inches. Plant cover includes mesquite, canotia, creosotebush, yucca, algerita, sideoats grama, three-awn, and needle-and-thread. They are calcareous throughout and have a light brown, soft surface layer that is either massive or has a platy or subangular blocky structure. The subsoil and substratum are brown to pink, are hard or extremely hard, and are either massive or have blocky or platy structure.
Laveen: Laveen soils are deep, well-drained, very strongly calcareous fine sandy loams and gravelly sandy loams on alluvial fans and terraces. They formed in sediments derived from limestone and sandstone and occur in areas where average annual precipitation is about 13 inches. They have a pale brown to pink surface layer that is soft or very soft and has platy or subangular blocky structure. The subsoil and substratum are pink to white, soft, very strongly calcareous material thath has blocky structure or is massive. The substratum contains some lime concretions and some cemented layers. Plant cover includes scattered juniper trees, mesquite, yucca, cacti, canotia, snakeweed, and native grasses.
Guest: Guest soils are deep, well-drained, calcareous soils on alluvial fans and bottom lands. They formed in alluvium derived mainly from basalt and partly from limestone. They have a brown surface layer that is slightly hard when dry and has platy structure. The subsoil and substratum are brown and have blocky structure. The subsoil is hard or very hard, and the substratum is hard. Small pebbles of basalt occur on the surface in some places. They occur in areas where average annual precipitation is about 12 inches. Plant cover includes mesquite, catclaw, and tobosa. Some areas are nearly barren, but others have a dense stand of tobosa.
Williams, J.A.; Anderson, T.C., Jr. 1967. Soil Survey of Beaver Creek Area, Arizona. USDA Forest Service, Soil Conservation Service and Arizona Agriculture Experiment Station.