In between Junction Canal and California Aqueduct which one was last used in 1871, and was then abandoned?
California Aqueduct The Governor Edmund G. Brown California Aqueduct is a system of canals, tunnels, and pipelines that conveys water collected from the Sierra Nevada Mountains and valleys of Northern and Central California to Southern California. Named after California Governor Edmund Gerald "Pat" Brown Sr., the over 400 mi aqueduct is the principal feature of the California State Water Project.
La Grange Mine The La Grange Mine is a former mine located in Trinity County, California. At one time it was the largest hydraulic mine in California. Started operating in 1862, over 3,500,000 dollars of gold was extracted before it was closed down in 1918 due to rising costs of labor and steel after World War I. The quality of gold was low so hydraulic mining was used to take it from the ground. The site is now a California Historical Landmark.