Spearfish (Exit 10) Intersection Project on Interstate 90 Begins Final Phase of Northern Median Construction

For Immediate Release:

Thursday, Nov. 5, 2026
Contact:
Zach Kuhn, Project Engineer, 605-892-2872

Spearfish (Exit 10) Intersection Project on Interstate 90 Begins Final Phase of Northern Median Construction

SPEARFISH, S.D. - Beginning Monday, Nov. 9, 2026, the loon turnaround at exit 10 on Interstate 90 near Spearfish will open to traffic. A loon is a paved bulb-out designed to allow vehicles to turn around.

Crews will begin the final phase of construction on the new northern median and turn lane on North Avenue. During this phase, left turns from Old Highway 14 will be prohibited. Northbound left turns from North Avenue onto Old Highway 14 will also be prohibited. Motorists are encouraged to use exit 8 to access Old Highway 14 until the new northbound left-turn movement on North Avenue is constructed. All I-90 ramps will remain open.

New traffic signals at the eastbound I-90 off-ramp and North Avenue are expected to be installed in January 2027.

Motorists should anticipate slower speeds and remain alert for changing traffic patterns throughout the work zone.

Project Information:
Additional project information can be found on the SDDOT website at https://dot.sd.gov/i-90exit10.

The prime contractor for this $1.3 million project is Tru-Form Construction, Inc. of Black Hawk, SD. The overall project completion date is Friday, Nov. 20, 2026.

About SDDOT:
The mission of the South Dakota Department of Transportation is to provide a safe and efficient public transportation system.

For the latest on road and weather conditions, road closures, construction work zones, commercial vehicle restrictions, and traffic incidents, please visit https://sd511.org or dial 511.

Read more about the innovative work of the SDDOT at https://dot.sd.gov.

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