APM: 21 Location: SR 299 and SR 139, Modoc Cty Reassurance shield as 139 joins 299. 299 is the dominant route here because of its former days as a U.S. highway. APM: 17 Location: SR 299 and Pit River Rd, Modoc Cty Reassurance shield a few miles later. APM: 8 Location: SR 299 and CR 198, Modoc Cty … Continue reading California State Route 139, SR 299 to SR 299