Idaho State Highway 1

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]

State Highway 1 marker

State Highway 1

North and South Highway Copeland – Porthill Branch
Copeland – Porthill Road
ID 1 highlighted in red
Route information
Maintained by ITD
Length11.185 mi[1] (18.001 km)
Existedc. 1926[2]–present
Tourist
routes		Part of the International Selkirk Loop
Major junctions
South end US 95 near Copeland
North end Hwy 21 in Porthill
Location
CountryUnited States
StateIdaho
CountiesBoundary
Highway system
  • Idaho State Highway System
← SH-200→ US 2

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.

Locationmi[1]kmDestinationsNotes
Copeland0.0000.000 US 95Southern terminus
Porthill11.13017.912U.S. Customs Building
11.18518.001 Hwy 21Northern terminus; Continues into British Columbia as BC 21
1.000 mi = 1.609 km; 1.000 km = 0.621 mi

See also

References
  1. Staff (January 29, 2008). "Milepost Log: State Highway 1". Idaho Transportation Department. Archived from the original on December 12, 2012. Retrieved October 4, 2008.
  2. Auto Road Atlas (Map) (1926 ed.). Rand McNally and Company. 1926. § A2.
  3. Idaho Transportation Department (May 22, 2007). "Bonners Ferry Port of Entry". Archived from the original on October 23, 2008. Retrieved October 4, 2008.
  4. United States Department of Transportation. "America's Scenic Byways: International Selkirk Loop". Retrieved October 4, 2008.
  5. Kootenai National Wildlife Refuge (January 24, 2004). "International Selkirk Loop Receives Idaho State Scenic Byway Status". Bonners Ferry, Idaho: Kootenai National Wildlife Refuge.
  6. The Road Atlas (Map). Rand McNally. 2008. p. 31. § A2. ISBN 0-528-93961-0.
  7. State Highway 1 Overview Map (Map). Cartography by NATVEQ. Google Maps. 2008. Retrieved September 25, 2008.
  8. Idaho Official State Highway Map (Map) (2009 ed.). Cartography by State of Idaho. Idaho Transportation Department. 2009.
  9. Western States road map (Map) (1935 ed.). Cartography by H.M. Gousha Company. Standard Oil Company. 1935.
  10. Road map: Idaho, Montana, Wyoming (Map) (1937 ed.). Cartography by Rand McNally and Company. Texaco. 1937. Retrieved October 4, 2008.
  11. SlekrikLoop.org. "A Brief History of the Loop". Retrieved October 4, 2008.
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