Interstate 84 in Idaho partially coincident with Idaho State Highway 25
Mountain Home and Magic Valley
The highway crosses into Elmore County and rejoins the Union Pacific Railroad's Nampa Subdivision as it passes the Morley Nelson Snake River Birds of Prey National Conservation Area. I-84 then travels around the city of Mountain Home, while a signed business route serves the city center and leads to the nearby Mountain Home Air Force Base. On the east side of the city, I-84 intersects SH-51 and ends its concurrency with US 20, which continues east towards Sun Valley, Idaho Falls, and Yellowstone National Park. I-84, US 26, and US 30 continue southeast through the conservation area and descends from the plateau into the Snake River Plain. The freeway travels around the north side of Hammett, which is served by a business route that connects to SH-78, and reaches the Snake River.I-84 travels upstream along the north bank of the Snake River to Glenns Ferry, where it bypasses the town and Three Island Crossing State Park. The freeway crosses over the river twice east of Glenns Ferry to avoid a bend in the river, which is followed by the railroad. After entering Gooding County, I-84 reaches the town of Bliss, where US 30 and US 26 both split from the freeway and end their concurrency. US 30 travels south along the Snake River towards Hagerman, while US 26 runs east across the plains to Gooding and Craters of the Moon National Monument and Preserve. The freeway continues southeast and crosses 250 feet (76 m) over the Mallad Gorge (part of Thousand Springs State Park) on a pair of level bridges. I-84 then passes through farmland on the edge of a lava plain while following an abandoned railroad right of way to Wendell, where it intersects SH-46.The freeway travels around the south side of Wendell and turns east to follow an active railroad through a rural area that marks the boundary of Jerome County. I-84 reaches the county seat, also named Jerome, and turns southeast after intersecting SH-25 to bypass the city. The interstate intersects SH-79 on the south side of Jerome and reaches a partial cloverleaf interchange with US 93 across the Snake River Canyon from the city of Twin Falls. I-84 then proceeds eastward through the rural Magic Valley, staying on the north side of the Snake River. It intersects SH-50 at Tipperary Corner and bends south around Skeleton Butte and a municipal airport in Hazelton. Between Hazelton and the Minidoka County line, I-84 is concurrent with SH-25, which continues along the north side of the valley.Southeastern Idaho
I-84 passes north of Burley, intersecting SH-27 near Paul. At a partial cloverleaf interchange in northeastern Heyburn, the freeway intersects SH-24 and is rejoined by US 30, beginning a new concurrency as the highway leaves the Magic Valley. I-84 crosses over the Snake River into Cassia County and intersects SH-25 and SH-25 at an interchange on the east bank of the river near Declo. Near the Minidoka National Wildlife Refuge, I-84 reaches the western terminus of I-86, which carries US 30 and follows the Snake River upstream to American Falls and Pocatello. I-84 turns southeast from the interchange and continues into the Raft River Valley, running parallel to SH-81 near Horse Butte in view of the Cotterel Mountains.After crossing the rural valley, I-84 begins following Meadow Creek and climbs into Mortenson Canyon, which marks the northeastern extent of the Black Pine Mountains. The highway crests at Sweetzer Summit, located 5,522 feet (1,683 m) above sea level, and descends into the Juniper Valley on the south side of the Sublett Range in Sawtooth National Forest. I-84 continues southeast across the valley, passing a set of rest areas in Oneida County, and reaches the Utah state border northwest of Snowville. The freeway continues into Utah and passes through Ogden before terminating at a junction with I-80 in the Wasatch Range.
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