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 (18.001 km)
Existed:	c. 1926 – present
Tourist routes:	Part of the International Selkirk Loop
Major junctions
South end:	US 95 near Copeland
North end:	BC 21 in Porthill
Location
Counties:	Boundary
Highway system
State Highways in Idaho Interstate U.S. State ← 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. 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.

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. 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.