Road conditions
Every closure and crash COtrip is publishing, on one map with the route and mile marker. Below it: Eisenhower Tunnel and Vail Pass, the I-70 corridor page, and what the season does to Colorado's highways. For the whole country, see the US closures map.
Colorado's DOT traveler site. The list of record for closures, restrictions and detours.
Mountain passI-70 over the summit: cameras, restrictions and closures on one page.
Mountain passI-70 over the summit: cameras, restrictions and closures on one page.
CorridorThe whole I-70 corridor, every state it crosses, alerts by mile marker.
Mile markersHow Colorado numbers its highways and where the markers matter most.
ReportWhat the COtrip feed carried over the holiday weekend.
I-70 crosses roughly 450 miles of the state, from the Utah line through Grand Junction, over the Continental Divide, and through Denver to Kansas. I-25 runs the Front Range through Pueblo, Colorado Springs, Denver and Fort Collins. US-50 and US-160 carry traffic across the southern half of the state, and US-40 and US-550 thread the high country.
I-70 west of Denver is the winter story. CDOT's traction law and chain law take effect by mile range, Vail Pass and the Eisenhower Tunnel approaches close in storms, and Glenwood Canyon closes for rockfall and mudslides. The Eisenhower-Johnson tunnel sits around mile markers 213 to 215 at roughly 11,100 feet. Out on the plains, I-25 and I-70 east of Denver close in blizzards when wind takes the visibility.
Over 25 daily snapshots from September 1 to 25, 2026, MileCheck's archive of the COtrip feed held 905 unique reports, including 2 closure reports, 53 crash reports and 787 work-zone reports. The routes with the most reports were I-70, I-25 and SH-470. Counts reflect what the feed publishes, so a state whose DOT posts only closures shows only closures. Read the September Highway Report.
The map above shows every full closure COtrip is publishing as a red marker, 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. It reloads every five minutes. If the feed cannot be reached the page says so instead of showing an empty map. For the official list, open COtrip.
COtrip is the official source, and dialing 511 in most states reaches the same information by phone. This page reads the same COtrip feed and adds the corridor and pass pages, and your own mile marker if you carry the app.
Chain and traction rules are set by COtrip per road and per direction, and they change with the storm. Restrictions the DOT publishes as alerts appear on the map above and on the Eisenhower Tunnel and Vail Pass pages. Always follow the posted signs. What "chains required" means explains the levels.
Every five minutes. MileCheck's server fetches the COtrip feed, converts it to one format shared by all 50 states, and caches it for five minutes. Each alert also carries the time the DOT last updated it, shown in the list.
Yes. The app shows the same COtrip 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, $49.99 a year or $9.99 a month after a 7-day free trial.
Your mile marker shows even offline. COtrip 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.
The Monthly Highway Report
The month's numbers from DOT feeds in all 50 states and BC. See a sample: the Labor Day weekend report. No spam.
MileCheck