Idaho State Highway 1

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:	BC 21 in Porthill
Highway system
State Highways in Idaho ← SH-200 US-2 →

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

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	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

References

Route map: Bing / Google

1. Staff (January 29, 2008). "Milepost Log: State Highway 1". Idaho Transportation Department. Retrieved 2008-10-04.
2. Auto Road Atlas (Map) (1926 ed.). Rand McNally and Company. 1926. § A2.
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. 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. SlekrikLoop.org. "A Brief History of the Loop". Retrieved 2008-10-04.