Interstate 90 East - Spearfish to Sturgis

Milepost zero for I-90 in South Dakota coincides with mile marker 207.13 for Wyoming.
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Interstate 90 enters Lawrence County, South Dakota paralleling Old U.S. 14 to the south.
07/06/18

U.S. 14 overlaps with Interstate 90 east to Exit 112 at Wall.
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Crow Peak rises along the southeastern horizon.
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Prior to 2018, guide signs for Exit 2 were brown and white. Red Hill Road was added to new signage.
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Sign replacements made at Exit 8 by 2018 replaced B.H. National Forest with Old Belle Road.
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U.S. 85 south ties into Interstate 90 at the diamond interchange (Exit 10) with the Spearfish Business Loop.
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Business Loop I-90 runs 4.8 miles through Spearfish along North Avenue, Main Street and Colorado Boulevard.
07/06/18

The Butte County seat of Belle Forche lies 10.7 miles to the north along U.S. 85 at U.S. 212 Business (State Street).
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U.S. 85 south joins I-90/U.S. 14 east 7.8 miles across the Spearfish city limits.
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Jackson Boulevard stems west from the diamond interchange at Exit 12 to Business Loop I-90 (Main Street) in Downtown Spearfish.
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Parallel Business Loop I-90 (North Avenue) diverges from I-90/U.S. 14-85 along a commercialized stretch into the Spearfish residential street grid.
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Black Hills State University lies west of Spearfish Creek and Downtown Spearfish.
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Advancing southeast, I-90/U.S. 14-85 run between Lookout Mountain Park and Spearfish Canyon Country Club golf course.
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U.S. 14A constitutes a 43.63 mile loop south from Spearfish into Black Hills National Forest and east to Lead, Deadwood and I-90/U.S. 14 at Sturgis.
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Business Loop I-90 returns to I-90/U.S. 14-85 at Exit 14 via N 27th Street from parallel Colorado Boulevard.
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2016/17 construction converted the diamond interchange at Exit 14 into a SPUI.
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08/12/16

Interstate 90 crosses northern reaches of Centennial Prairie by Black Hills Airport / Clyde Ice Field (SPF) east beyond False Bottom Creek.
08/12/16

Green Mountain and Polo Peak punctuate the hills south of I-90/U.S. 14-85 within Black Hills National Forest.
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U.S. 85 branches south from I-90/U.S. 14 at the succeeding exit to Deadwood, Lead and Cheyenne Crossing in Black Hills National Forest.
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U.S. 85 travels south from the diamond interchange at Exit 17 to Newcastle, Lusk and Cheyenne, Wyoming.
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The unincorporated community of St. Ongie is 5.9 miles north of U.S. 85 via nearby St. Ongie Road.
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Encircling Elkhorn Peak to the north, I-90/U.S. 14 advance five miles east to the city of Whitewood.
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08/12/16

SD 34 converges with Interstate 90 southeast from Saint Onge at Exit 23 in Whitewood.
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SD 34 overlaps with I-90/U.S. 14, 6.4 miles southeast to Sturgis.
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I-90/U.S. 14-SD 34 cross the Meade County line southwest of Oyster Mountain.
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U.S. 14A returns to I-90/U.S. 14 at Exit 30 beyond Boulder Canyon.
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SD 34 separates from I-90/U.S. 14 east across Sturgis to Fort Meade.
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2.8 miles in length, the Sturgis Business Loop for I-90 overlaps with SD 34/79 along Lazelle Street east to Downtown Sturgis. The route lines Junction Avenue south back to I-90.
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The city of Sturgis is known for its annual Motorcycle Rally.
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A diamond interchange (Exit 32) joins I-90/U.S. 14-SD 79 with the east end of Business Loop I-90 and Junction Avenue.
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