Road conditions
Every closure and crash Caltrans QuickMap is publishing, on one map with the route and mile marker. Below it: the live cameras, The Grapevine (Tejon Pass), Donner Pass and Cajon Pass, the I-5, I-80, I-10, I-15 and I-40 corridor pages, and what the season does to California's highways. For the whole country, see the US closures map.
California's DOT traveler site. The list of record for closures, restrictions and detours.
CamerasEvery Caltrans QuickMap camera on one map, with the route and mile marker where the DOT gives one.
City camerasLive cameras on the Los Angeles freeways.
City camerasLive cameras on the Sacramento freeways.
City camerasLive cameras on the San Diego freeways.
City camerasLive cameras on the San Francisco freeways.
Mountain passI-5 over the summit: cameras, restrictions and closures on one page.
Mountain passI-80 over the summit: cameras, restrictions and closures on one page.
Mountain passI-15 over the summit: cameras, restrictions and closures on one page.
CorridorThe whole I-5 corridor, every state it crosses, alerts by mile marker.
CorridorThe whole I-80 corridor, every state it crosses, alerts by mile marker.
CorridorThe whole I-10 corridor, every state it crosses, alerts by mile marker.
CorridorThe whole I-15 corridor, every state it crosses, alerts by mile marker.
CorridorThe whole I-40 corridor, every state it crosses, alerts by mile marker.
DrawbridgesWhere the movable spans are and the federal opening rule for each.
Mile markersHow California numbers its highways and where the markers matter most.
ReportWhat the Caltrans QuickMap feed carried over the holiday weekend.
I-5 runs the full length of the state, from the Mexican border through Los Angeles, up the Central Valley past Sacramento to the Oregon line. US-101 follows the coast from Los Angeles through the Bay Area to the redwoods. I-80 climbs from Sacramento over Donner Summit toward Reno, chain-control country every winter. I-15 carries Los Angeles traffic over Cajon Pass toward Las Vegas, and US-395 traces the Eastern Sierra past Lone Pine, Bishop and Mammoth.
Chain controls on I-80 over Donner Summit and on US-50 arrive with every Sierra storm, posted by Caltrans as R1, R2 or R3. I-5 over the Grapevine closes for snow a few times most winters. Tule fog settles on the Central Valley from November into February and can cut visibility on I-5 and SR-99 to a few car lengths. In summer and fall, wildfires close highways with little notice, and the map above carries those closures as Caltrans posts them.
Over 25 daily snapshots from September 1 to 25, 2026, MileCheck's archive of the Caltrans QuickMap feed held 3,471 unique reports, including 893 closure reports, 269 crash reports, 1,824 work-zone reports and 85 weather reports. The routes with the most reports were US-101, I-5 and SR-1. 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 Caltrans QuickMap 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 Caltrans QuickMap.
Caltrans QuickMap is the official source, and dialing 511 in most states reaches the same information by phone. This page reads the same Caltrans QuickMap feed and adds the California cameras, the corridor and pass pages, and your own mile marker if you carry the app.
Chain and traction rules are set by Caltrans QuickMap 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 The Grapevine (Tejon Pass), Donner Pass and Cajon Pass pages. Always follow the posted signs. What "chains required" means explains the levels.
Every five minutes. MileCheck's server fetches the Caltrans QuickMap 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 Caltrans QuickMap 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. Caltrans QuickMap 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