Idaho Transportation Department Logo Idaho Transportation Department   Highway Info
This website will transition to a NEW 511 site. Start using it NOW & give us feedback.
Highways with Mountain Passes
US 12 1 mountain pass
I-15 2 mountain passes
US 20 2 mountain passes
ID 21 4 mountain passes
ID 28 1 mountain pass
ID 29 1 mountain pass
US 30 3 mountain passes
ID 31 1 mountain pass
ID 33 1 mountain pass
ID 36 1 mountain pass
ID 38 1 mountain pass
ID 55 1 mountain pass
ID 71 1 mountain pass
ID 75 1 mountain pass
I-84 1 mountain pass
ID 87 1 mountain pass
US 89 1 mountain pass
I-90 2 mountain passes
US 93 3 mountain passes
US 95 3 mountain passes
Mountain Passes—Southwest Idaho
Map of Southwest Idaho Between Exit 29: US 20; Franklin Road and Exit 38: I-84B; 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. Speed limit 55 MPH. From 9:00PM MDT to 5:00AM MDT daily. Until January 28, 2021 at about 6:00AM MDT. Between Smith's Ferry Drive - High Valley Road and Round Valley Road (12 to 13 miles south of the Cascade area). The road is closed. From 10:00AM MDT to 2:00PM MDT on Monday, Tuesday, Wednesday and Thursday. Until September 24, 2021 at about 11:59PM MDT. Between Exit 112: I-84B and Exit 125: 18th East Street (5 miles west of the Glenns Ferry area). Road construction work is in progress. The roadway is reduced to one lane. There is a width limit in effect. Speed restrictions are in force. Speed limit 70 MPH. Width limit 14'0". Until October 30, 2020 at about 11:59PM 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 Southbound Malad Summit Rest Area and Exit 36: US 91; Hawkins Road (7 to 8 miles south of the Arimo area). Bridge construction work is in progress. The roadway is reduced to one lane. Northbound traffic. Speed restrictions are in force. There is a width limit in effect. Speed limit 65 MPH. Width limit 16'0". 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 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 (12 to 13 miles south of the Cascade area). Road construction work is in progress. The roadway is reduced to one lane. Look out for temporary traffic lights. There is a width limit in effect. Speed restrictions are in force. Expect delays. The intersecting road is closed. A detour is not available. Speed limit 25 MPH. Width limit 13'0". Vehicle length limit 75 ft. Until November 15, 2020 at about 11:59PM MDT. Between ID 16 and North Linder Road (1 to 3 miles west of the Eagle area). Road construction work is in progress. There is work on the shoulder. The roadway is reduced to one lane. Until November 30, 2020 at about 11:59PM MDT. Between Jerico Road (near Eagle) and ID 55 (Boise). Road construction work is in progress. There is work on the shoulder. There is a width limit in effect. Width limit 11'0". Until November 18, 2020 at about 8:00PM MDT. Between Thompson Creek Road (5 miles south of the Clayton area) and US 93 (20 miles north of the Clayton area). There is danger of a rock fall. Drive with extreme caution. Between Redfish Lake Road (near Stanley) and Squaw Creek Road (5 miles south of the Clayton area). Look out for large animals on the roadway. Between Exit 216: ID 25; ID 77 and Exit 228 (10 to 12 miles east of the Heyburn area). Road construction work is in progress. The road is being repaved. The roadway is reduced to two lanes. Follow the signs. Speed restrictions are in force. There is a width limit in effect. Speed limit 70 MPH. Width limit 12'0". Until November 30, 2020 at about 8:00PM MDT. Between Exit 15: Raft River and Exit 36: ID 37; Interstate 86 Business (1 to 22 miles west of the American Falls area). Road construction work is in progress. The road is being repaved. Road maintenance work is in progress. The roadway is reduced to one lane. Speed limit 65 MPH. Width limit 14'0". Until November 3, 2020 at about 7:00PM MDT. Between Exit 1: I-84 and Eastbound Coldwater Rest Area (22 to 37 miles west of the American Falls area). Road construction work is in progress. The road is being repaved. The roadway is reduced to two lanes. Follow the signs. Speed restrictions are in force. There is a width limit in effect. Speed limit 70 MPH. Width limit 12'0". Until November 30, 2020 at about 8:00PM MDT. Between US 20 (5 miles west of the Atomic City area) and Section Road (7 miles east of the Atomic City area). There is work on the shoulder. Until October 30, 2020 at about 7:00PM MDT. Between ID 78 and Sunnyslope Road (near Marsing). Road construction work is in progress. There is work on the shoulder. Until October 31, 2020 at about 7:00PM MDT. Between Spurwing Way (1 mile west of the Eagle area) and Jerico Road (Eagle). Road construction work is in progress. There is work on the shoulder. Look out for flaggers. Until October 30, 2020 at about 11:59PM MDT. Between ID 55; Eagle Road (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 US 20 (Boise). Look out for rush hour traffic. Between Prairie Creek Road and King Creek Road (16 to 17 miles north of the Ketchum area). Road construction work is in progress. Bridge construction work is in progress. The roadway is reduced to one lane. Look out for temporary traffic lights. Speed restrictions are in force. There is a width limit in effect. Speed limit 35 MPH. Width limit 11'0". Until October 31, 2020 at about 9:00PM MDT. Between Cloverdale Road - Joplin Road and I-184 (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: ID 69 (near Meridian). Look out for rush hour traffic. Between Exit 309: Science Drive (Idaho Falls) and Burton Road (1 mile west of the Rexburg area). Bridge construction work is in progress. A lane is closed intermittently. Width limit 14'0". Until today at about 7:00PM MDT.
ID 21: Banner Creek
ID 28: Gilmore
ID 21: Highland Valley
ID 38: Holbrook
US 93: Nevada Line Pass
ID 75: Galena
I-15: Monida Pass
ID 21: Mores Creek
ID 21: Beaver Creek
ID 71: Brownlee
US 95: Midvale Hill
ID 55: Horseshoe Bend Hill
I-15: Malad
US 20: Cat Creek
I-84: Sweetzer
US 93: Willow Creek
Google Static Map Image
Mountain Pass Mountain Pass