Idaho State Highway 1
State highway Boundary County, Idaho, United States
From Wikipedia, the free encyclopedia
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.[3] 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.[4][5]
routesPart of the International Selkirk Loop
State Highway 1 | ||||
|---|---|---|---|---|
| North and South Highway Copeland – Porthill Branch Copeland – Porthill Road | ||||
 ID 1 highlighted in red | ||||
| Route information | ||||
| Maintained by ITD | ||||
| Length | 11.185 mi[1] (18.001 km) | |||
| Existed | c. 1926[2]–present | |||
| Tourist routes | Part of the International Selkirk Loop | |||
| Major junctions | ||||
| South end |  US 95 near Copeland | |||
| North end |  Highway 21 at the Canadian border in Porthill | |||
| Location | ||||
| Country | United States | |||
| State | Idaho | |||
| Counties | Boundary | |||
| Highway system | ||||
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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.[6] 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.[7][8]
History
SH-1 was originally created in the 1920s as part of Sampson Trail B, which ran from Boise north to Lewiston, Coeur d'Alene, before entering British Columbia at Porthill.[2] Later in the mid-1930s, Idaho adopted a new numbered highway system with SH-1 as one of the first highways.[9][10] The International Selkirk Loop, which uses SH-1, was formed in 1999.[11] The loop became an Idaho Scenic byway on January 21, 2004, as the Wild Horse Trail.[5]
Major intersections
The entire route is in Boundary County.
| Location | mi[1] | km | Destinations | Notes | |
|---|---|---|---|---|---|
| Copeland | 0.000 | 0.000 | US 95 – Bonners Ferry | Southern terminus | |
| Porthill | 11.130 | 17.912 | U.S. Customs Building | ||
| 11.185 | 18.001 | Highway 21 – Creston | Continuation into British Columbia | ||
| 1.000 mi = 1.609 km; 1.000 km = 0.621 mi | |||||
