South DakotaDepartment of Transportation
Transportation
Aviation
About Office of Aeronautics Services
Office of Aeronautics Services
Airports Conference
Aerospace Education
Airport Information
Links
Aviation Systems Plan
Bridges
Office of Bridge Design
Design & Plans
Historical Bridges
Inventory & Inspection
Posted Structures
Reference Information
SD Bridge Photos
Doing Business
Certification & Accreditation
About Certification & Accreditation
SDDOT Accreditation Certification List
Approved Products
Manuals & Documents
Welding Certifications
Training
Contractors
Bid Letting Information
Concrete Pipe Release
Contractors/Suppliers
Prequalified Contractors
CMS Web Reports
Disadvantaged Business Enterprise (DBE)
Fuel Price Index
Labor Compliance
Materials
Preconstruction Meetings
Price Adjustment Guidelines
Standard Specifications
Subcontract Requirements
Forms & Documents
Webinars
Alternative Contracting
Engineering/Design Services
Consultant Services
Downloadable Files
Manuals
News & Updates
Right of Way / Relocation Assistance
Standard Bid Items
Standard Plates
Surveyors
Utility Coordination
Environmental
About Environmental
Agreements
Endangered Species
Environmental Assessments
Forms
Stormwater
Wetland Mitigation
Local Governments
About Local Governments
Bridge Improvement Grants
City/County Fund Balances
Emergency Relief (ER)
Federal Bridge Program
Forms & Documents
Secure Accounts Billing
Transportation Economic Development Grants
Urban Systems
Rural Access Infrastructure Fund Program
Traffic Incident Management
Training
Projects & Studies
Planning
Carbon Reduction Strategy
Freight Plan
Long Range Plan
Metropolitan Planning Organization
Non-state Public Road Inventory
Pavement Condition Monitoring
Pavement Management
South Dakota EV Fast Charging Plan
Statewide Transportation Improvement Program – STIP
Transportation Asset Management Plan (TAMP)
Construction Projects
Inside SDDOT
Forms & Publications
Brochures
Forms
Manuals
Maps
Newsletters
Reports
SDDOT Engagement Opportunities
Join One of Our Contact Lists
Press Releases
Media Kits
News Stories
Branding and Identity Guidelines
Learn More about the SDDOT Logo
SDDOT Blog
Press Releases
Lane Reduction and Width Restriction Planned on Missouri River Bridge at Mobridge for Utility Maintenance
September 26, 2025
On Monday, Sept. 29, 2025, the Missouri River bridge over U.S. Highway 12 located just west of Mobridge will be reduced to one 12-foot wide lane of traffic.
SDDOT Seeks Public Input for I-29 Corridor Study (Jefferson to Sioux City)
September 26, 2025
The South Dakota Department of Transportation (SDDOT), in collaboration with the City of North Sioux City, community of Dakota Dunes, Union County, Iowa DOT, Siouxland Interstate Metropolitan Planning Council, and the Federal Highway Administration (FHWA), will hold a public meeting open house from 4:30 p.m. to 6:30 p.m. on Thursday, Oct. 9, 2025, for the Interstate 29 Corridor Study.
Repair Work Scheduled to Begin on Interstate 90 Business Loop in Oacoma
September 23, 2025
On Thursday, Oct. 2, 2025, repair work is scheduled to begin on the Interstate 90 Business Loop (S.D. Highway 248) from Miller Place to just east of Emmett Avenue in Oacoma.
Shoulder Paving Project Scheduled on U.S. Highway 85 Between Belle Fourche and Spearfish
September 18, 2025
On Thursday, Sept. 25, 2025, a shoulder milling and paving project is scheduled to begin on northbound U.S. Highway 85 between Belle Fourche and Spearfish.
Interstate 229 Northbound Temporary Lane Closure Scheduled at Cliff Avenue (Exit 4) in Sioux Falls
September 16, 2025
Beginning at 7 p.m. on Tuesday, Sept. 23, 2025, the northbound lanes of Interstate 229 will be temporarily closed.
