does the winter road report show?
It shows general conditions on a grid of major highways.
Detailed conditions change faster than can be reported,
and it's usually unclear if the frozen stuff is snow, slush,
or ice. For that reason, only general conditions are shown.
It's impossible to report conditions on the more than 32,000
miles of road on the state highway system. That's why a
set of major highways across the state was selected for
Major routes affect the highest volume of traffic and people,
and are MoDOT's highest priority and receive the most attention.
Because of this, supplementary and/or minor routes may not
be in as good of condition.
How current is the report?
MoDOT staff across the state updates the report daily. Updates
are more frequent during winter storms. The computer system
is set up to update the report twice an hour. If there are
changes, a new map and text report are generated automatically.
The text report shows the date and time conditions
were last updated. The map has the time and date the map
last changed. To ensure you're viewing the most up-to-date
information, you may need to "refresh" the page
using your browser.
Please keep in mind that the information is a report of
conditions as of the latest update, which may have changed
within the past half hour. It is not a prediction of future
conditions, nor is it a weather report.
What do the different conditions mean?
To keep the report simple, only five condition categories
Dry - The surface is generally dry and normal. Watch
for ice patches when temperatures are low. Frost can also
cover dry pavement without warning. Drive carefully.
Wet - The surface is wet, but not yet freezing as
of the last report. Wet roads can be slick and may freeze
suddenly. Often, salt and traffic will keep main roads wet
when bridges or smaller roads are covered. Please use caution.
Partly Covered - The surface has frozen patches on
it. Bridges and minor roads will likely be in worse condition.
Avoid driving in these conditions if possible.
Covered - The surface is more than 50 percent covered
with frozen material. Driving in these conditions can be
dangerous. Please avoid driving if at all possible.
Closed - Conditions sometimes warrant closure of
the road until work or weather improve the driving surface.
Every storm is different. Road conditions
depend on many factors - temperature, traffic, precipitation
and more. MoDOT works hard to keep roads open and in normal
condition. Our goal is to return all roads to normal in
less than a day. If you can, avoid driving until our crews
have had time to clear the roads.
Why does the report say wet when my street
is ice covered?
The report shows only major routes and general conditions
as they were last reported. It doesn't predict future conditions,
and some sections/spots may be in worse shape then the road's
overall or general condition. City, county, and minor state
highways are often in worse condition than the major highways
shown in the report. We plow and treat major highways more
frequently than minor ones.
- Frost often happens on clear mornings and can be as
slick as solid ice.
- Bridges, northern slopes, and shaded areas tend to
- Melted snow and ice can refreeze and still look like
- If temperatures are low enough, salt will not have any
- MoDOT uses salt and salt water before an approaching
storm in an effort to prevent ice on major roadways.
- Allow extra driving time in the winter and watch for
local or sudden changes.
- Whenever possible, avoid driving in winter storms.