Idaho State Highway 1

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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
Length: 11.185 mi[2] (18.001 km)
Existed: c. 1926[1] – present
Part of the International Selkirk Loop
Major junctions
South end: US-95 near Copeland
North end: BC 21 in Porthill
Highway system

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]

Route description[edit]

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]


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.[1] 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[edit]

The entire route is in Boundary County.

Location mi[2] km Destinations Notes
Copeland 0.000 0.000 US-95 Southern terminus
Porthill 11.130 17.912 U.S. Customs Building
11.185 18.001 BC 21 Northern terminus; Continues into British Columbia as BC 21
1.000 mi = 1.609 km; 1.000 km = 0.621 mi


Route map: Bing / Google

KML is from Wikidata
  1. ^ a b Auto Road Atlas (Map) (1926 ed.). Rand McNally and Company. 1926. § A2. 
  2. ^ a b Staff (January 29, 2008). "Milepost Log: State Highway 1". Idaho Transportation Department. Retrieved 2008-10-04. 
  3. ^ Idaho Transportation Department (2007-05-22). "Bonners Ferry Port of Entry". Retrieved 2008-10-04. 
  4. ^ United States Department of Transportation. "America's Scenic Byways: International Selkirk Loop". Retrieved 2008-10-04. 
  5. ^ a b Kootenai National Wildlife Refuge (2004-01-24). "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 2008-09-25. 
  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 2008-10-04. 
  11. ^ "A Brief History of the Loop". Retrieved 2008-10-04.