CN-12-201-293NA Klamath Project - Oregon-California. Experimental Line in Unit 71. Close-up of open trench showing pipe. Pipe was laid to grade, then backfilled with excavated material. This was an experimental line that was placed in the north end of Unit #71. The pipe is enclosed in a fiber glass sock; February 1973; Bureau of Reclamation photo by D. W. Stein