State Highway 3
North Idaho Medal of Honor Highway
SH-3 highlighted in red
Route information
Maintained by ITD
Length	117.680 mi[1][2] (189.388 km)
Major junctions
South end	US 12 near Spalding
Major intersections	SH-99 in Kendrick SH-8 in Deary SH-8 in Bovill SH-6 near Santa SH-5 in St. Maries SH-97 near Harrison
North end	I-90 near Rose Lake
Location
Country	United States
State	Idaho
Counties	Nez Perce, Latah, Shoshone, Benewah, Kootenai
Highway system
Idaho State Highway System Interstate US State
← US 2 → SH-4

State Highway 3 (SH-3) is a state highway in northern Idaho, connecting U.S. Route 12 near Spalding, east of Lewiston, with Interstate 90 near Rose Lake, east of Coeur d'Alene. It is 117.68 miles (189.4 km) in length and runs north–south,^[1] east of and generally parallel to Idaho's primary north–south highway, U.S. Route 95.

SH-3's southern terminus is near Arrow Gulch Creek Bridge to the east of Spalding on US 12 on the Nez Perce Indian Reservation in Nez Perce County. It then heads generally northeast into eastern Latah County, where it leaves the reservation, and continues through Juliaetta and Kendrick, where it intersects SH-99. It then continues generally north to Deary, where it overlaps SH-8. The overlapping highways continue east and northeast to Bovill, where they diverge.^[1][2]

SH-3 then continues generally north through Shoshone County, crossing the Saint Maries River, into Benewah County. It then turns generally northwest to Santa, where it intersects SH-6.^[1]

SH-3 then continues generally north to Saint Maries, where it intersects SH-5 before crossing the Saint Joe River and entering the Coeur d'Alene Indian Reservation. It then continues generally northwest and north past a historical marker for Saint Joseph Indian Mission into Kootenai County.^[1][3]

In Kootenai County, SH-3 continues generally north past an intersection with SH-97 and a historical marker for The Mullan Road, then over Mission Hill Creek Grade and Black Rock Grade before leaving the Coeur d'Alene reservation. It then turns east and northeast along and across the Coeur d'Alene River to Rose Lake. It then continues generally northeast and east to the northern terminus, east of the 4th of July Creek Bridge on I-90.^[1][3]

This section needs expansion. You can help by adding to it. (December 2009)

In 2011, the state legislature designated SH-3 as the North Idaho Medal of Honor Highway.^[4]

County	Location	mi[1]	km	Destinations	Notes
Nez Perce	​	0.000	0.000	US 12 – Lewiston, Orofino, Missoula	Southern terminus
Latah	Kendrick	12.355	19.883	SH-99 north – Troy
	Deary	29.000	46.671	SH-8 west – Moscow	Begin SH-8 overlap
	Bovill	39.000	62.764	SH-8 east – Elk River	End SH-8 overlap
Shoshone	No major junctions
Benewah	​	70.070	112.767	SH-6
	St. Maries	84.542	136.057	SH-5 west – Plummer
Kootenai	​	95.880	154.304	SH-97 – Harrison
	​	117.680	189.388	I-90 – Coeur d'Alene, Kellogg, Missoula
1.000 mi = 1.609 km; 1.000 km = 0.621 mi       Concurrency terminus

• List of state highways in Idaho
• List of highways numbered 3

Media related to Idaho State Highway 3 at Wikimedia Commons