Identified in caption as Johnny Sommerville, 'a buckaroo'. Ethnicity is a little hard to determine from this picture, most likely Native American, possibly even African American
Group with truck (probably a GMC) loading or unloading for a picnic. People not identified, probably Mrs. Woodhouse at far right, maybe Katharine Baily (her family was located at the salt works) or Mrs. Cadman standing next to rear wheel of truck.
A four-horse team pulls a scraper, guided by three unidentified students, possibly including Julian Steward DS18 (center). Side view of a nice-looking team.
Teams of four horses (left), two horses (center) and two mules (right) begin to dig the lower reservoir, pulling the bucket scrapers known as "Fresnos". A very fine pair of mules on the right.