| State: | UT |
| Type: | BL |
| Route: | 15 |
| Spur Type: | I |
| Spur Of: | 15 |
| Length Mi: | 6.0264 |
| Direction A: | South |
| Terminus A: | in Elwood |
| Junction: |
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| Direction B: | East |
| Terminus B: | in Tremonton |
| Counties: | Box Elder |
Interstate 15 Business Loop (I-15 BL) is a 6.0264miles eastern business loop off of I-15 in Box Elder County, Utah, that passes through Elwood and Tremonton. It is partially concurrent with I-84 BL and is the last business route along I-15 in the state.[1]
I-15 BL begins along Utah State Route 13 (SR-13) at a diamond interchange on I-15/I-84 (exit 376) in Elwood. (I-15/I-84 heads north and west toward Tremonton, Riverside, and Snowville in Utah and then on to Malad City, Pocatello, and Twin Falls in Idaho. I-15/I-84 heads south and east toward Honeyville, Brigham City, Ogden, and Salt Lake City. SR-13 heads south toward Bear River City, Corrine, and Brigham City.) From its southern terminus, I-15 BL proceeds north along North 5200 West, concurrent with I-84 BL/SR-13, to leave Elwood (at West 10400 North) and enter Tremonton, about 3500feet later (at about 400 South). Upon entering Tremonton, North 5200 West becomes South 1600 East. After reaching Haws Corner Junction at East Main Street, I-15 BL/I-84 BL turns to west (left) to run along Utah State Route 102 (SR-102/East Main Street) as they leave their concurrency with SR-13. (SR-13 continues north along North 5200 West toward Riverside and Plymouth and SR-102 heads east along West 11200 North toward Deweyville and Logan.)
Proceeding west I-15 BL/I-84 BL/SR-102 reaches its junction with the southern end of Utah State Route 82 (North 300 East) at a T intersection. (SR-82 heads north along North 300 East toward Garland.) At Tremonton Street, the three routes transition from transition from East Main Street to West Main Street. Next I-15 BL leaves the concurrency with I-84 BL/SR-10 when it turns north at the intersection with North 1000 West (Iowa String Road) on the southeast corner of the Box Elder County Fairgrounds. (I-84 Bus./SR-102 continues west to pass under I-15 and on to I-84. Iowa String Road [South 1000 West] heads south toward Utah State Route 83 and Corinne) Proceeding north again, I-15 Bus. runs along North 1000 West to pass by the east side of the fairgrounds and the Bear River Valley Hospital.
Immediately after passing the hospital, I-15 BL makes another left turn to proceed west on West 1000 North and pass by the north side of the hospital. (North 1000 West continues north toward Garland and West 1000 North continues east toward Garland and SR-13.) Continuing west on West 1000 North I-15 Bus. until finally reaches its northern terminus at another diamond interchange on I-15 (exit 381) on the northern edge of Tremonton. (I-15 heads north toward Riverside in Utah and then on to Malad City and Pocatello in Idaho. I-15 heads south to merge with I-84 and then on toward Elwood, Honeyville, Brigham City, Ogden, and Salt Lake City. West 1000 North continues west to end at I-84.)
While fairly adequate signage previously existed along both I-15 BL and I-84 BL, by 2024, it was extremely limited.