Dump truck in action at the construction of the San Gabriel dam, 1936

Photograph of a dump truck in action at the construction of the San Gabriel dam, 1936. The back of the truck is visible as it dumps a load of dirt on a tall pile of rocks at center. Two men with hoses are wetting the pile down from left and right. In the background, a brush-covered hill is visible. A sign in the foreground bears the numbers 5 and 6.

1936年圣盖博水坝（San Gabriel Dam）施工现场作业中的自卸卡车照片。可见该卡车车尾正将渣土倾倒至画面中央的高大石堆之上。两名手持水龙带的工人分别从左右两侧对该石堆进行洒水作业。背景中可见覆盖有植被的山丘。画面前景处设有一块标牌，其上标注有数字5与6。