WAPA's 500 kV line starts at the Captain Jack substation () well to the northeast of Round Mountain. This is the Western Area Power Administration's (WAPA) Path 66 transmission line. It also heads southwest across the Modoc Plateau and crosses Interstate 5 near Cottonwood (north of Red Bluff). West of Cottonwood the line turns south and enters an electrical substation near Olinda. At Olinda, lines carrying power from Shasta Dam and other nearby United States Bureau of Reclamation facilities connect with the line. This is the end of Path 66, but WAPA's 500 kV line continues from Olinda Substation along the western edge of the Sacramento Valley. Near Antioch the line runs parallel with the two PG&E lines. All three lines cross both the Sacramento and San
