Purchase includes free access to book updates online and a free trial membership in the publisher's book club where you can select from more than a million books without charge. Chapters: List of Idaho State Highways, U.s. Route 95 in Idaho, Idaho State Highway 1, Idaho State Highway 21, Idaho State Highway 41, Idaho State Highway 75, Idaho State Highway 8, Idaho State Highway 52, Sampson Trails, Idaho State Highway 51, Idaho State Highway 11, Idaho State Highway 6, Idaho State Highway 25, Idaho State Highway 200, Idaho State Highway 7, Idaho State Highway 5, Idaho State Highway 4, Idaho State Highway 9, Idaho State Highway 24, Idaho State Highway 39, Idaho State Highway 13, Idaho State Highway 74, Idaho State Highway 14, Idaho State Highway 28. Excerpt: State Highway 1 (SH-1) is a state highway in Boundary County, in the U.S. state of Idaho . It extends 11.185 miles (18.00 km) from U.S. Route 95 (US-95) east of Copeland, north to British Columbia Highway 21 (BC 21) in Porthill . The route serves as a connector between Bonners Ferry, via US-95 south, Porthill, and Creston, BC . The highway is one of two border crossings from Idaho into British Columbia . The other crossing is at the US-95/BC 95 in Eastport. The highway is also known for being the only state highway in Boundary County, the two other highways are US-95 and US-2 . The highway is also part of the International Selkirk Loop, the only international scenic byway in North America. Route description SH-1 runs 11.92 miles (19.18 km) from U.S. Route 95 (US-95) east of Copeland, north to BC 21 in Porthill . The route links Bonners Ferry, via US-95 south, Porthill, and Creston, BC . The road is the only state highway in Boundary County, the two other highways are US-95 and US-2 . The highway starts at an intersection with US-95 east of Copeland. History SH-1 was originally created in the 1920's as part of Sampson Trail B, which ran from Boise north to Lewiston, Coeur d'Alene, before entering British...