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Lane Restriction Planned on U.S. Highway 12 at West End of Missouri River Bridge Near Mobridge

During the afternoon hours on Wednesday, Oct. 29, 2025, the west end of the Missouri River Bridge over U.S. Highway 12 (located just west of Mobridge) will be reduced to one 11-foot wide lane of traffic. Read More

SDDOT Seeks Public Input on Environmental Assessment and Section 4f Evaluation for Interstate 229 Exit 3 Interchange in Sioux Falls

The South Dakota Department of Transportation (SDDOT), in collaboration with the Sioux Falls Metropolitan Planning Organization (MPO), and the City of Sioux Falls, will hold an in-person public meeting open house on Wednesday, Nov. 5, 2025, from 5-6:30 p.m. (CT). Read More

Traffic Shift and Overnight Lane Closures Scheduled on Interstate 90 at Hartford (Exit 387)

Beginning on Thursday, Oct. 16, 2025, traffic will be shifted onto the new pavement and bridge on Western Avenue over Interstate 90 at exit 387 (Hartford). Read More

SDDOT Seeks Public Input for Proposed S.D. Highway 25 Reconstruction Project (S.D. Highway 34 to the Hanson/Miner County Line)

The South Dakota Department of Transportation (SDDOT) will hold a public meeting open house on Tuesday, Oct. 28, 2025, from 5:30 – 7 p.m. (CT) to inform area residents of the proposed S.D. Highway 25 reconstruction project from S.D. Highway 34 to the Hanson/Miner County line. Read More

SDDOT Seeks Public Input for Proposed Reconstruction Project at U.S. Highway 85 and Colorado Boulevard Intersection in Spearfish

The South Dakota Department of Transportation (SDDOT) will hold a public meeting open house on Tuesday, Oct. 28, 2025, at 5:30 p.m. (MT) to inform area residents of the proposed project to reconstruct the intersection of U.S. Highway 85 and Colorado Boulevard in Spearfish. Read More

Road Closure Scheduled for U.S. Highway 385 from Pactola Dam to Taylor Ranch Road Near Hill City

Beginning on Monday, Oct. 20, 2025, U.S. Highway 385 from the south end of Pactola Dam to Taylor Ranch Road will be closed to through traffic. Read More

SDDOT Seeks Public Input for S.D. Highway 115 Corridor Study in Sioux Falls Area

Open houses are scheduled for Tuesday, Oct. 21, 2025, from 5 – 6:30 p.m. at The Riverside, located at 317 E. 4th St. in Dell Rapids; and Wednesday, Oct. 22, 2025, from 5 – 6:30 p.m. at Special Olympics South Dakota, located at 800 E. Interstate Ln. in Sioux Falls. Read More

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Updated Move Over Law in South Dakota

South Dakota’s updated Move Over Law became effective as of Tuesday, July 1, 2025. The updated law now applies to all vehicles occupying the shoulder using amber, yellow, or blue warning lights. Read More

Diverging Diamond Interchange

The LaCrosse Street Diverging Diamond Interchange (DDI) in Rapid City and the 41st Street DDI in Sioux Falls were designed to enhance safety and address future travel needs in high volume intersections within two communities experiencing population growth. The DDI design improves safety by reducing vehicle conflict points. Read More