Interstate 90 in Idaho

This article is about the section of Interstate 90 in Idaho. For the entire length of the highway, see Interstate 90.

Interstate 90
Route information
Maintained by ITD
Length:	73.888 mi (118.91 km)
Major junctions
West end:	I-90 at Washington state line
	SH-41 in Post Falls US-95 in Coeur d'Alene SH-97 near Coeur d'Alene SH-3 near Cataldo SH-4 in Wallace
East end:	I-90 at Montana state line
Highway system
Interstate Highway System Main Auxiliary Business State Highways in Idaho ← US-89 US-91 →

In the U.S. state of Idaho, Interstate 90 has a small routing in the panhandle, just under 74 miles (120 km). Traveling east from Spokane, Washington, I-90 passes through Post Falls and Coeur d'Alene, over Fourth of July Summit, and through the Silver Valley before entering Montana at Lookout Pass.

I-90 is a major east-west route and the only freeway in northern Idaho. At 73.9 miles (119 km), I-90 has the third longest stretch of Interstate highway in Idaho. Interstate 84 and Interstate 15 are longer. Interstate 86 and Interstate 184 are shorter. I-90 is the only coast-to-coast Interstate in Idaho.

Route description

Interstate 90 enters Idaho and Kootenai County just east of the Spokane River bridge near the community of State Line (which is the smallest city in Idaho). I-90 proceeds east through Post Falls to Coeur d'Alene. In Coeur d'Alene, which is the Kootenai County seat, I-90 meets U.S. Route 95. I-90 turns southeast and passes north of downtown, which is accessible via an Interstate Business Loop, and Lake Coeur d'Alene. I-90 continues east-southeast to Fourth of July Summit (elevation 3,081 feet (939 m)) and Cataldo, Idaho, which is home to the Old Cataldo Mission built in 1853. Shortly after leaving Cataldo, I-90 leaves Kootenai County and enters Shoshone County. The freeway passes through or near the communities of Pinehurst, Kellogg, Osburn, Wallace, and Mullan. Wallace is the Shoshone county seat. I-90 leaves Shoshone County and Idaho at Lookout Pass (elevation 4,725 feet (1,440 m)) and enters Montana.

History

The small town of Wallace in the Silver Valley still prides itself on having what was the last stop light on I-90. Its downtown has many historical buildings, which would have been wiped out by the original planned route of the freeway, so in 1976, city leaders had the downtown placed on the National Register of Historic Places. As a result, the federal government was forced at great expense to reroute the freeway to the northern edge of downtown and elevate it. That section of I-90 opened in September 1991. A bicycle path is routed beneath part of that segment. Before the move to the viaduct I-90 would go from a freeway at the western edge of Wallace before turning to surface streets and following the main arterial through town, upon reaching the eastern edge of the town then became a limited access divided highway once again.

The interstate also was routed along Lake Coeur d'Alene as a surface street before the Veterans Memorial Centennial Bridge was completed in the heights above the lake.

Interstate 90 on the 1991 viaduct in Wallace, Idaho.

Exit list

County	Location	Mile	km	Exit	Destinations	Notes
Kootenai		0.000	0.000		I-90 west	Continuation into Washington
	Post Falls	2.080	3.347	2	Pleasant View Road
		4.632	7.454	5	I-90 Bus. east (Spokane Street) – City Center	Exit is just east of northernmost point on I-90
		5.450	8.771	6	I-90 Bus. west (Seltice Way) – City Center	Westbound exit and eastbound entrance
		7.128	11.471	7	SH-41 north – Rathdrum, Spirit Lake
	Coeur d'Alene	11.290	18.169	11	I-90 Bus. east (Northwest Boulevard) – City Center
		12.040	19.377	12	US-95 – Sandpoint, Moscow
		12.560	20.213	13	4th Street
		13.560	21.823	14	15th Street
		14.780	23.786	15	I-90 Bus. west (Sherman Avenue) – City Center
		16.882	27.169	17	Mullan Trail Road
		22.063	35.507	22	SH-97 south – Harrison, St. Maries
		28.380	45.673	28	Fourth of July Pass Recreation Area
		34.028	54.763	34	SH-3 south – Rose Lake, St. Maries, Harrison
		39.024	62.803	39	Old Mission State Park
		40.096	64.528	40	Cataldo
Shoshone		43.016	69.228	43	Kingston
		45.261	72.841	45	Pinehurst, Smelterville
		47.687	76.745	48	Smelterville, Shoshone County Airport
	Kellogg	49.715	80.009	49	Bunker Avenue – Silver Mountain
		50.321	80.984	50	Hill Street	Eastbound exit and westbound entrance
		50.551	81.354	51	Division Street – Wardner	No westbound entrance
		54.186	87.204	54	Big Creek
	Osburn	57.036	91.791	57	I-90 Bus. east – Osburn
		59.553	95.841	60	I-90 Bus. west – Silverton, Osburn
	Wallace	60.990	98.154	61	I-90 Bus. east – Wallace
		61.948	99.696	62	I-90 Bus. west / SH-4 east – Wallace, Burke
		64.270	103.433	64	Golconda District
		65.352	105.174	65	Compressor District
		66.500	107.021	66	Gold Creek	Eastbound exit and entrance
		67.353	108.394	67	Morning District, West Mullan
	Mullan	68.100	109.596	68	I-90 Bus. east – Mullan	Eastbound exit and westbound entrance
		68.908	110.897	69	I-90 Bus. west – Mullan, East Mullan
		73.888	118.911		I-90 east (Lookout Pass)	Continuation into Montana
Concurrency terminus       Closed/former       HOV only       Incomplete access       Tolled/ETC       Unopened

Related routes

• Interstate 90 Business (Coeur d'Alene, Idaho)
• Interstate 90 Business (Mullan, Idaho)
• Interstate 90 Business (Osburn, Idaho)
• Interstate 90 Business (Post Falls, Idaho)
• Interstate 90 Business (Wallace, Idaho)
• U.S. Route 10

References

Template:Attached_KML/Interstate 90 in Idaho

Interstate 90
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