A slip (also sometimes called a scoop, scraper, or road scraper) was the common implement for moving dirt when doing such things as digging ponds or making fills where large volumes of dirt were needed.
RIO GRANDE. The Rio Grande rises in Rio Grande National Forest, San Juan County, Colorado (at 37Â°47' N, 107Â°32' W), as a clear, spring and snow-fed mountain stream 12,000 feet above sea level. Its origin is at the Continental Divide in the San Juan Mountains.
You can locate all these rivers on a detailed Texas River Map. Rio Grande: The Rio Grande River creates a natural boundary with the Mexican states of Coahuila, Chihuahua, Tamaulipas, and Nuevo Leon to the south. It is also the biggest river in the state. The length of the river is 1,896 miles or 3,051 km.