Two interstate highways cut across South Dakota. Interstate 90 runs east-west through the state with access to Sioux Falls, Mitchell, Rapid City and Spearfish. Interstate 29 runs north-south through the eastern part of the state from the North Dakota border to Brookings, Sioux Falls and North Sioux City. And while the interstates can help you make good time, don’t forget to have a good time exploring alternate routes and scenic byways whenever possible. Request a state highway map, guides or brochures by completing the form on the Request Free Vacation Guide page.

View and/or download our detailed state map (GIF).

View a full, interactive state map on Google.

Road Conditions

Get current road conditions, including closures and construction, from the South Dakota Department of Transportation (DOT). Dial 511 from any phone to receive up-to-date, location-specific road restrictions, conditions and weather information for any interstate, US or state highway in South Dakota and several adjoining states. You can also call 866-MYSD511 (866-697-3511).

Safe Travel USA is the website dedicated to providing current highway information for several northern Plains states, including South Dakota, North Dakota, Montana and Wyoming. For South Dakota-specific information about interstate and highway conditions, closures and construction, go to

Information Centers and Rest Areas

You’ll find 13 information centers and eight rest areas along Interstates 90 and 29. The Information Centers are staffed from mid-May through mid-September and offer brochures and maps as well as in-person travel information. The rest areas offer minimal services including restrooms and pay phones. Both the information centers and the rest areas include dump stations for RVs and campers. The South Dakota Department of Transportation (DOT) offers an even more detailed location map, which also includes ports of entry.