MileCheckIowa sits in the middle of everything, and I-80 is the reason. Here's how mile markers work across the state, where they matter most in winter, and how to see your exact one plus live Iowa DOT conditions in real time.
How Iowa numbers its highways
Iowa's mile markers count up from the west and the south. On I-80, mile 0 sits at Council Bluffs on the Missouri River and the numbers climb east to the Quad Cities. On I-35, they start at the Missouri line and rise toward Minnesota. When the Iowa DOT closes a road or reports a crash, the location comes as a route and a milepost. Mile marker data for every Iowa highway is bundled into MileCheck and works offline.
The corridors people actually drive
- I-80 crosses about 306 miles from Council Bluffs through Des Moines and past Iowa City to the Quad Cities — the great truck river of the middle of the country.
- I-35 runs south to north through Des Moines, where it briefly shares pavement with I-80 on the metro's north side.
- I-29 follows the Missouri River up the state's western edge through Sioux City.
- US-20 crosses the north through Waterloo and Fort Dodge; US-30, the old Lincoln Highway, parallels I-80 a county to the north.
Where mile markers matter most: winter on the open interstate
Iowa's signature hazard is the ground blizzard — clear sky above, zero visibility at windshield height as wind picks the snow up off the fields. When it happens, the Iowa DOT closes I-80 and I-35 by mile range, and the difference between "closed at milepost 70" and your own position is the whole decision: pull off now, or keep rolling. Knowing your milepost turns a vague radio warning into an answer.
Blizzards, ice, and the closure gates
Iowa winters close interstates several times a season. Freezing rain glazes the I-80 hills east of Des Moines; wind-driven snow shuts the open western stretches. Closures are posted by mile range and lifted the same way, so the milepost is the language of the whole event. And in summer, when RAGBRAI sends thousands of cyclists across the county roads, the paved grid gets busy in its own way — knowing exactly where you are never stops being useful here.
Live Iowa DOT alerts, in one place
MileCheck pulls live road alerts straight from the Iowa DOT: closures, crashes, construction, and winter conditions, tied to the mile marker and direction so you can see what's ahead of you on your route. The alert and your own milepost sit on the same screen — no juggling a state website at 70 mph.
Everyday and emergency
Whether you're trucking I-80 through the night, watching a ground blizzard build west of Des Moines, or reporting a breakdown on I-35, the mile marker is the location Iowa's roads run on. MileCheck shows yours in real time, down to a tenth of a mile, even where the cell signal drops — and it works on CarPlay and Android Auto.
Keep reading
Nearby state guides: Illinois · Minnesota · Missouri · Nebraska · South Dakota · Wisconsin
Essentials: What to tell 911 on the highway · How to find your mile marker · Browse the live mile marker map · All 50 states