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. 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.

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 (18.001 km)
Existedc.1926–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
  • Interstate
  • US
  • State
SH-200 US 2
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