Interstate 90 in Idaho

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

Interstate 90 marker

Interstate 90
Route information
Maintained by ITD
Length: 73.89 mi[1] (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

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.[2] 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.[1] I-90 is the only coast-to-coast Interstate in Idaho.

Route description[edit]

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.[2]


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.[3] 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[edit]

County Location mi[1] km Exit[1] Destinations Notes
Kootenai   0.000 0.000 I‑90 west Continuation into Washington
Post Falls 1 Beck Road
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
1.000 mi = 1.609 km; 1.000 km = 0.621 mi

Related routes[edit]


Route map: Bing

Interstate 90
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