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
Tentative 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
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.
Electrical Conduit Repair Scheduled to Begin on I-90 at Exits 10, 14, and 58 (Rapid City Region)
September 15, 2025
On Monday, Sept. 22, 2025, work will begin to repair conduit attached to the Interstate 90 bridges at exit 10 (Belle Fourche/Spearfish), exit 14 (Spearfish), and exit 58 (Rapid City/Haines Avenue).
Construction Project Scheduled to Begin on U.S. Highway 16A East of Custer
September 12, 2025
Beginning on Monday, Sept. 29, 2025, a road construction project is scheduled to begin on U.S. Highway 16A near Custer.
S.D. Highway 25 Scheduled to Close for Grading Work in Clark County
September 12, 2025
On Monday, Sept. 15, 2025, S.D. Highway 25 in Clark County will be closed from S.D. Highway 20 north for three miles.
