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Mountain Passes
I‑15 ID 55 ID 75 I‑84 US 93 US 95
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Mountain Passes—Southwest Idaho
Map of Southwest Idaho Between Second Street West and Rock Creek Road (19 miles east of the Fairfield area). The road is rough. Between Exit 114 (5 miles west of the Glenns Ferry area) and Exit 121 (near Glenns Ferry). The road is being reconstructed. Eastbound traffic. The right lane is closed. Westbound traffic. The left lane is closed. Width limit 14'0". Speed limit 65 MPH. Until August 21, 2021 at about 11:59PM MDT. Between US 20 and Exit 38: I-84B Nampa; Garrity Blvd (near Nampa). Road construction work is in progress. The roadway is reduced to one lane. Speed restrictions are in force. There is a width limit in effect. Expect delays. The road is being repaved. There is work on the shoulder. Bridge construction work is in progress. Speed limit 55 MPH. Expect 10 - minute delays. Width limit 12'0". From 9:00PM MDT to 5:00AM MDT daily. Until May 15, 2021 at about 6:00PM MDT. Between Thompson Creek Road (3 miles south of the Clayton area) and US 93 (20 miles north of the Clayton area). Look out for large animals on the roadway. Prepare to stop. Between Smith's Ferry Drive - High Valley Road and Round Valley Road (13 miles south of the Cascade area). Major road construction work is in progress. Until May 27, 2021 at about 11:59PM MDT. Between Exit 165 and Exit 173 (4 miles east of the Jerome area). Road construction work is in progress. There is a width limit in effect. The road is being repaved. There is work on the shoulder. People are working in the median. Reduce your speed. The roadway is reduced to one lane. The left lane is closed. Consider using an alternate route. Speed limit 65 MPH. Width limit 12'0". Until July 15, 2021 at about 5:30PM MDT. Between Johnson Road and McKim Creek Road (19 miles north of the Challis area). There is danger of a rock fall. Drive with extreme caution. Between Redfish Lake Road (Stanley) and US 93 (20 miles north of the Clayton area). There is danger of a rock fall. Drive with extreme caution. Between The Owyhee - Canyon County Line and Lakeshore Drive (1 to 13 miles south of the Nampa area). The road is rough. Between I-84; I-84B Bliss and 1000 East Road (1 mile east of the Bliss area). Road construction work is in progress. The road is being repaved. The roadway is reduced to one lane. The left lane is closed. Look out for temporary traffic lights. Short delays are possible. Speed restrictions are in force. There is a width limit in effect. Expect 5 - minute delays. Speed limit 35 MPH. Width limit 12'0". Until April 16, 2021 at about 5:00PM MDT. Between 1700 East Road and ID 46 (near Gooding). Road construction work is in progress. The road is being repaved. The roadway is reduced to two lanes. Speed restrictions are in force. There is a width limit in effect. Speed limit 35 MPH. Width limit 12'0". Until April 16, 2021 at about 5:00PM MDT. Between Southbound Malad Summit Rest Area and Malad Summit (10 miles north of the Malad City area). The rest area is closed. Between Exit 28: 10th Street (Caldwell) and Exit 33 (near Nampa). Road construction work is in progress. The right shoulder is closed. The road is being repaved. Reduce your speed. There is a width limit in effect. The roadway is reduced to one lane. Speed limit 55 MPH. Width limit 16'0". Until July 1, 2021 at about 6:00AM MDT. Between US 20 and The Butte - Jefferson County Line (10 to 43 miles west of the Mud Lake area). Look out for large animals on the roadway. Between Salmon Avenue (Arco) and Brunt Road (24 miles west of the Idaho Falls area). Look out for large animals on the roadway. Between Lava Lake Road (16 miles north of the Carey area) and US 20 (Arco). Look out for large animals on the roadway. Between McGowan Creek Road (13 miles south of the Challis area) and McKim Creek Road (20 miles north of the Challis area). Look out for large animals on the roadway. Between State Street and Riverside Drive (Eagle). Road construction work is in progress. The roadway is reduced to one lane. From 10:00PM MDT to 6:00AM MDT on weekends and from 10:00PM MDT to 5:00AM MDT on weekdays. Until September 20, 2021 at about 5:00AM MDT. Between Round Valley Road (10 miles south of the Cascade area) and Lenora Street (McCall). The road is rough. Look out for potholes. Drive carefully. Between Oak Street (Shelley) and Heyrend Way (near Idaho Falls). Road construction work is in progress. The shoulder is closed. Until August 13, 2021 at about 6:00PM MDT. Between Old Highway 91 and 2000 South Road; Menan Butte Road (13 to 15 miles west of the Rexburg area). Be aware of the animal crossing area. Drive with extreme caution. Between Smith's Ferry Drive - High Valley Road and Round Valley Road (13 miles south of the Cascade area). The road is closed to traffic. From 10:00AM MDT to 2:00PM MDT on Monday, Tuesday, Wednesday and Thursday. Until May 27, 2021 at about 2:00PM MDT. Between ID 21 (Stanley) and Squaw Creek Road (5 miles south of the Clayton area). Look out for large animals on the roadway. Between North Linder Road and North Meridian Road (near Eagle). Road construction work is in progress. There are alternating lane closures. There is work on the shoulder. Consider using an alternate route. Speed restrictions are in force. Speed limit 45 MPH. Until October 1, 2021 at about 6:00PM MDT. Between US 93 (Arco) and New Sweden School Road (near Idaho Falls). Look out for mobile maintenance operations. Look out for flaggers. A pilot car is in operation. Drive with extreme caution. Prepare to stop. Between ID 55 (Eagle) and US 20; Glenwood Street (Garden City). Look out for rush hour traffic. Between US 20 (Arco) and Hammond Lane (near Challis). Look out for large animals on the roadway. Between Eleventh Avenue North Extension (5 miles east of the Caldwell area) and North Fox Run Avenue (near Eagle). Look out for rush hour traffic. Between I-84 and the end of I-184 (Boise). Look out for rush hour traffic. Between Cloverdale Road - Joplin Road and Eighth Street (Boise). Look out for rush hour traffic. Between I-84 (Meridian) and US 20 (Boise). Look out for rush hour traffic. Between Exit 28: 10th Street (Caldwell) and Exit 35: Northside Boulevard (Nampa). Look out for rush hour traffic. Between Exit 36 (Nampa) and Exit 44 (near Meridian). Look out for rush hour traffic. Between Maires Lane - D-C Bar Road and Hayden Creek Lane (12 to 17 miles north of the Leadore area). Road construction work is in progress. Until July 31, 2021 at about 6:00PM MDT.
ID 75: Galena
ID 21: Highland Valley
ID 55: Horseshoe Bend Hill
US 93: Willow Creek
ID 38: Holbrook
US 20: Cat Creek
I-84: Sweetzer
US 93: Nevada Line Pass
ID 28: Gilmore
ID 21: Mores Creek
US 95: Midvale Hill
I-15: Monida Pass
ID 21: Banner Creek
I-15: Malad
ID 71: Brownlee
ID 21: Beaver Creek
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Mountain Pass Mountain Pass