I-15/84 South - Tremonton to Ogden

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Business Loop I-15/84 return to I-15/84 at Exit 376 south alongside SR 13 (5200 West) in the town of Elwood.
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SR 13 is the old alignment of U.S. 30S/191 from Tremonton south to Brigham City.
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SR 13 originated from Interstate 15 at Exit 392 near Plymouth. The state route continues south from Exit 376 to Bear River City, Corinne and I-15/84 again at Exit 365.
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Business Loop I-15/84 run north along SR 13 to Crossroads and west with SR 102 (11200 North) into Tremonton.
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I-15/84 span the Bear River one mile north of the diamond interchange (Exit 372) with SR 240 (6900 North) east. Originating in the High Uinta Mountains, the Bear River is the single largest tributary of the Great Salt Lake. 491 miles in length, the river flows north through Evanston, Wyoming, northwest into Idaho, and southwest into the Great Salt Lake.
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SR 240 (6900 North) constitutes a 1.20 mile long link between Exit 372 and SR 38 (2600 West) in the city of Honeyville.
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6900 North extends west as 7200 North to SR 13 north of Bear River City. Points of interest for Exit 372 include Crystal Hot Springs along SR 38 north, a resort that features both a cold spring and hot spring located within 50 feet of each other.
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A 345kV power line crosses over I-15/84 between Exit 372 and the Utah Welcome Center. These lines help form the backbone of electricity transmission from Ogden south to Provo.
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The rest area and tourist information center along I-15/84 southbound is located at mile marker 367 on the north side of Brigham City.
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SR 13 (900 North) meets I-15/84 at the first of three exits for Brigham City ("Beautiful Brigham: Your Future Is Here"). Sitting at an elevation of 4,436 feet above sea level, the seat of Box Elder County was settled in 1851.
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SR 13 (900 North) runs east along old U.S. 30S/191 to SR 38 (old SR 69) at N Main Street. SR 13 continues south to Downtown Brigham City and U.S. 89/91 (1100 South).
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SR 13 doubles as Business Loop I-15/84 south into Brigham City. The route is unmarked on guide signs for Exit 365.
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Removed by 2018, these trailblazers were the only signage referencing the Brigham City business loop for I-15/84. The route is sparsely marked along SR 13 (Main Street).
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SR 83 west from SR 13 in Corinne leads toward the Golden Spike National Historic Site. According to the National Park Service,

on May 10, 1869, the Union and Central Pacific Railroads joined their rails at Promontory Summit. Golden Spike National Historic Site commemorates this incredible accomplishment of this nation's first transcontinental railroad.

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Forest Street heads east from Exit 363 to Downtown Brigham City and west to the Bear River Migratory Bird Refuge.
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Exit 362 joins I-15/84 with the south end of U.S. 91. A relatively short U.S. highway, U.S. 91 travels north from Brigham City to Logan and Preston, Idaho, then rejoins the Interstate 15 corridor near Downey, Idaho.
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U.S. 91 (1100 South) runs across south Brigham City, just north of the Perry city line. U.S. 89/91 overlap northeast to Logan.
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Historically U.S. 91 extended south from Brigham City to Long Beach, California. Interstate 15 vastly replaced the route, and U.S. 91 was truncated north to Brigham City in 1974.
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U.S. 91 travels 45.22 miles in Utah, traversing the Wellsville Mountains northeast to Wellsville and leading north from Cache Valley to Smithfield, Richmond and the state line near Franklin, Idaho.
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Open to traffic on September 16, 2014, the diverging diamond interchange at Exit 362 was the first in Utah. Construction at the exchange cost $14 million.¹
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Port of entries (weigh stations) operate along both directions of I-15/84 at mile marker 359.
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The diamond interchange at Exit 357 connects I-15/84 with SR 315 (750 North) and Willard Bay State Park.
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SR 357 follows a 1.77 mile long L-shaped route south to the marina at Willard Bay North State Recreation Area and east along 750 North to U.S. 89 in the city of Willard.
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The distance sign referencing Willard was removed during six lane expansion of I-15/84.
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SR 126 branches south from parallel U.S. 89 into a parclo interchange with I-15/84 at Exit 351.
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Paralleling I-15 to the west, SR 126 constitutes a 21.71 mile long route south to Layton. SR 126 replaced SR 84 south from Farr West to SR 26 (old U.S. 91) in Roy.
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SR 126 north to U.S. 89 south links I-15/84 with the city of Pleasant View.
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I-15/84 enter Weber County just beyond the exchange with SR 126.
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Advancing south along the Farr West and Pleasant View city line, I-15/84 reach Ogden in eight miles.
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SR 134 (2700 North) meets I-15/84 at a diamond interchange (Exit 349) in Farr West, midway between Plain City and Pleasant View.
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The east end of SR 134 (2600 North) ties into the north end of SR 235 (400 East) in North Ogden. Settled in 1850 and located at an elevation of 4,501 feet above sea level, the city' motto is "Making Life Better"
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14.37 miles in length, SR 134 turns south from Plain City to SR 37 at Kanesville.
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400 North is the first of two exits in the city of Marriott-Slaterville. Two previously unincorporated areas of Weber County merged into a single city by July 1999.
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I-15/84 converge with SR 39 (1200 South) at a diamond interchange (Exit 344) just west of the Ogden city line.
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A 67.84 mile long highway east along the Ogden River Scenic Byway to Huntsville and SR 16 in Woodruff, SR 39 (1200 South) originates to the west from SR 134 in West Weber.
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Spanning the Weber River, I-15/84 cross into northeastern reaches of the West Haven city limits. The ensuing exit is with SR 104 (2100 South).
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3.20 miles in length, SR 104 (2100 South) is a five lane boulevard east from SR 126 into Ogden. SR 104 partitions onto the couplet of 20th/21st Streets to SR 204 (Wall Avenue) north of Downtown.
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Curving southeast, I-15/84 enter the city of Ogden. The seat of Weber County, Ogden incorporated on February 6, 1851 and is the home of Weber State University.
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Forthcoming Exit 341 with SR 79 (31st Street) serves Ogden-Hinckley Airport (OGD) to the southwest and Weber State University via SR 203 (Harrison Boulevard) south.
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The diamond interchange at Exit 341 was originally a full cloverleaf.
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SR 79 runs 5.78 miles overall east to SR 203 (Harrison Boulevard) in Ogden and west to Roy and SR 108 (Midland Drive) in West Haven.
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Shifting southwest along the Ogden and Riverdale city line, I-15/84 advance to their separation at Exit 340. I-84 provides the most direct connection to all points east via I-80.
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Interstate 84 travels east by Washington Terrace to Unitah and South Weber before traversing the Wasatch Range through Weber Canyon.
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The final 38.80 miles of I-84 east lead to Mountain Green, Morgan, Henefer and I-80 at Echo.
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There is no direct access from I-15 to SR 26, a 3.74 mile long route southwest from U.S. 89 (Washington Boulevard) in Ogden to Riverdale and SR 126 (1900 West) in Roy. Interstate 84 east connects with SR 26 (Riverdale Road) at the succeeding exit.
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Interstate 84 separates from I-15 south with two lanes at a wye interchange (Exit 340).
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