Road conditions
Closures and crashes from SD511, on one map with the route and mile marker. Below it: the live cameras, the I-90 corridor page, and what the season does to South Dakota's highways. For the whole country, see the US closures map. City traffic cameras: Sioux Falls.
South Dakota's DOT traveler site. The list of record for closures, restrictions and detours.
South Dakota's official road conditions app is SDDOT 511.
Every SD511 camera on one map, with the route and mile marker where the DOT gives one.
Chain lawThe rule, its conditions and its sources.
CorridorThe whole I-90 corridor, every state it crosses, alerts by mile marker.
Mile markersHow South Dakota numbers its highways and where the markers matter most.
ReportWhat the SD511 feed carried over the holiday weekend.
I-90 crosses roughly 413 miles from the Wyoming line past Rapid City, Wall and Chamberlain to Sioux Falls. I-29 runs north to south along the eastern edge through Sioux Falls, Brookings and Watertown. US-14 and US-16 serve the Black Hills toward Mount Rushmore, and US-83 and US-281 cross the middle of the state north to south.
South Dakota closes interstates when blizzards or ice make travel unsafe, and those closures are announced by mile range. Winter systems can shut I-90 across whole counties, and spring flooding along I-29 in the Missouri and Big Sioux valleys has forced long detours. Between Rapid City and the Missouri River, exits get sparse and the towns small.
In October 2026, MileCheck's archive of the SD511 feed held 115 unique reports, including 1 closure report and 114 work-zone reports. The routes with the most reports were US-14, I-90 and US-281. Counts reflect what the feed publishes, so a state whose DOT posts only closures shows only closures. Read the October Highway Report.
The map above shows full closures from the SD511 feed as red markers, crashes in orange, and weather and hazard alerts in blue and purple. Closures the DOT has posted for a future date are listed as scheduled, and ramp and lane closures sit under the toggle so the list stays readable. The page checks MileCheck's feed every five minutes. If the feed cannot be reached the page says so instead of showing an empty map. For the official list, open SD511.
SD511 is the official source, and dialing 511 in most states reaches the same information by phone. This page reads the same SD511 feed and adds the South Dakota cameras, the corridor and pass pages, and your own mile marker if you carry the app.
This page checks MileCheck's feed every five minutes. SD511 updates individual reports on its own schedule. Source update times are shown when available.
Yes. The app shows the same SD511 alerts on your route, ahead of your position, with the mile marker you are passing. The mile marker works offline in all 50 states. Live alerts are part of MileCheck Premium, $19.99 a year or $4.99 a month after a 2-week free trial.
Your mile marker shows even offline. SD511 alerts on your route and the nearest camera are part of MileCheck Premium and need a connection to update. Runs on CarPlay and Android Auto.
More questions: Why is the highway closed? · Is there one app with 511 alerts for every state? · How do I tell 911 where I am on the highway?
The Monthly Highway Report
Closures, crashes and roadwork from the state road feeds, once a month in your inbox. See the October report. No spam.
MileCheck