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Traffic heat map of St. Croix County, Wisconsin: 628 miles of roads shaded from blue (light) to red (heavy traffic), busiest on I 94 and WI 35

St. Croix County, Wisconsin Traffic Counts

Its drivers come from neighborhoods among the top 3 counties in Wisconsin for household income. This page breaks down traffic in St. Croix County, Wisconsin across 628 miles of monitored roads split into 6,390 segments, using multi-sourced mobile and sensor data. It goes beyond raw counts to truck flow, congestion and who is driving, so site selection and route planning rest on evidence.
Data sourced from TrafficZoom's proprietary analytics platform.
Data current as of:
Q3 2026
Updated:
September 29, 2026
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Total Traffic Volume & Performance in St. Croix County, Wisconsin

Traffic

The average number of vehicles that travel each day over any road in the road network.

vehicles per day3,909
Trucks

The percentage of the total traffic volume composed of heavy vehicles.

13.6%
Average travel time

The average time of travel averaged among all vehicles traveling on the road network.

29.0 min
Congestion ratio

The rate at which the actual travel time exceeds free-flow travel time, averaged among all roads in the network.

11.2%
Drivers’ average age

Average age of residents in the geographic areas where the vehicle trips originated.

45.9 yrs
Drivers’ average income

Average income of residents in the geographic areas where the vehicle trips originated.

$100,410

Our data shows 3,909 vehicles per day on the average road in St. Croix County, Wisconsin, and 3,056,780 vehicle-miles traveled per day (≈1.1 billion per year) across its 628 miles of monitored roads. At 13.6%, the truck share runs above the 10.2% across Wisconsin: about 1 in 7 vehicles.

Shorter trips than 93% of counties in Wisconsin

St. Croix's average daily traffic volume of 3,909 vehicles per day is on par with the state average of 3,802. Network-wide, St. Croix accounts for about 2.3% of Wisconsin's statewide total of vehicle-miles. St. Croix carries more traffic than 80% of counties in Wisconsin.

Journey times run 10% lower than the state level, at 29.0 minutes on average. On travel time, St. Croix runs shorter than 93% of counties in Wisconsin.

Congestion is somewhat lower than the state level, at a ratio of 11.2% (10% lower) - crucial for traffic control improvement and logistics planning.

Highway vs. Non-Highway Traffic Analysis

highway traffic icon

Highway Traffic in St. Croix County, Wisconsin

Trafficvehicles per day9,427
Trucks17.2%
Average travel time44.5 min
Congestion ratio20.1%
Drivers’ average age45.3 yrs
Drivers’ average income$95,718

Highways carry more than half of all travel in St. Croix County, Wisconsin (65% of vehicle-miles). The average highway carries 9,427 vehicles per day, 192% more than the average non-highway road in the same area, which carries 3,233 vehicles per day.

Highways make up 24% of the monitored road miles (153 miles, 698 segments), so they carry more than their share: 1,972,449 vehicle-miles traveled per day (≈720 million per year).

By highway travel volume, St. Croix outranks 91% of counties in Wisconsin.

Higher highway truck share than 77% of counties in Wisconsin

The concentration of trucks on highways (17.2%) is 17% higher than the state average for similar road classifications. Highways here lean toward freight, so highway access is a real asset for logistics operators.

St. Croix's highway truck share (17.2%) is higher than 77% of counties in Wisconsin. St. Croix's highway truck count is higher than 72% of counties in Wisconsin, at roughly 1,624 trucks per day.

non-highway traffic icon

Non-highway Traffic in St. Croix County, Wisconsin

Trafficvehicles per day3,233
Trucks7.0%
Average travel time27.1 min
Congestion ratio10.2%
Drivers’ average age46.4 yrs
Drivers’ average income$104,150

Local roads carry a significant share of travel in St. Croix County, Wisconsin: 35% of all vehicle-miles. A typical local road sees 3,233 vehicles per day.

Spread over 475 miles and 5,692 segments, 76% of the road network, local roads carry a lighter load per mile: 1,084,331 vehicle-miles traveled per day (≈396 million per year). The truck share on non-highway roads is 7.0%.

Drivers from higher-income areas than 97% of counties in Wisconsin

The concentration of trucks on non-highway roads is 59% lower than on highways.

At 16% lower than the state level, the non-highway congestion ratio of 10.2% signals easier movement on local roads.

Trip origins here have higher average income than 97% of counties in Wisconsin. St. Croix's median driver age is lower than 89% of counties in Wisconsin.

Time-of-Day & Seasonal Patterns

peak hours icon
Peak Traffic Windows
Weekday peaks:
AM peak 10:00 AM–12:00 PM and a long afternoon plateau from 3:00 PM to 7:00 PM, with volumes reaching approximately 88% higher than the daily average.
Weekend traffic:
Weekends are somewhat quieter: volumes run about 13% below weekday levels, the usual weekend dip.
seasonal traffic icon
Seasonal Fluctuation
Busy season:
June–August is the high season, with volumes +11% versus the annual average.
Lowest month:
January is the quietest month, with volumes -17% versus the annual average - the usual winter low.

Data Finding: Hourly & Seasonal Patterns

In St. Croix County, Wisconsin, the peak hour concentrates about 8% of the day's traffic, and there is a strong seasonal swing of +11% in high season.

St. Croix County vs. Wisconsin Traffic Comparison

Of the four measures, truck share differs most: St. Croix County runs 34% above the Wisconsin average. Its highway truck share is also 17% above.

MetricSt. Croix CountyWisconsin averageDifference
Traffic3,9093,802+2.8%
Truck % (Total Traffic)13.6%10.2%+33.9%
Truck % (Highway)17.2%14.7%+17.2%
Avg. Travel Time29.0 min32.2 min-9.8%

How St. Croix County compares

St. Croix County against nearby counties

St. Croix County tracks the 4 areas around it closely - no measure in this table sets it far apart from the areas immediately next to it, though it has the second busiest roads of the five. Bigger and busier at once: more road than the areas around it and heavier traffic on it, which makes it the centre of gravity for travel in this part of the map.

St. Croix County and the 4 nearest county-level areas by centroid distance, with the Wisconsin average for scale.
AreaAverage daily trafficTruck shareDaily vehicle-milesAverage travel timeCongestion ratio
St. Croix County3,90913.6%3,056,78029.0 min11.2%
Washington County, Minnesota4,5716.7%5,429,76829.7 min13.2%
Pierce County, Wisconsin2,32910.2%649,25027.1 min9.0%
Dunn County, Wisconsin2,61117.7%1,778,77131.9 min10.1%
Polk County, Wisconsin2,2959.5%915,29734.1 min8.3%
Wisconsin average3,80210.2%N/A32.2 min12.6%

St. Croix County ranked within Wisconsin

St. Croix County sits in Wisconsin's top three on average driver income.

St. Croix County ranked among 72 county-level areas in Wisconsin (1 = highest); measures without data in every county rank a smaller field, down to 58.
MeasureSt. Croix CountyWisconsin rank
Traffic volume (AADT)3,909#15 of 72
Highway vehicle-miles per day1,972,449#6 of 58
Truck share on highways17.2%#14 of 58
Highway trucks per day1,624#17 of 58
Average travel time29.0 min#67 of 72
Average driver income$100,410#3 of 72
Average driver age45.9 yrs#64 of 72

St. Croix County ranks #3 of 72 on average driver income but #67 of 72 on average travel time - the two describe the same roads and are worth reading together rather than either on its own.

Busiest roads in St. Croix County, Wisconsin

The three busiest roads in St. Croix County average 36,297 vehicles a day, 9.3 times the county average of 3,909 across all its monitored roads.

I 94 leads with 71,874 vehicles a day, 9,748 of them trucks (13.6%). No other road comes close: WI 35, in second place, carries 20,144. It also carries the most trucks.

Trips using I 94 are long: a median of 37.8 minutes against 29.0 county-wide, the mark of a through route.

Ranked by daily traffic (AADT)

Cars and light vehiclesTrucks
1I 94Motorway · 71,874vehicles9,748trucks · 13.6%
Road class
Motorway
Congestion ratio
52.6%
Median trip time
37.8 min
Drivers’ median age
44.8 yrs
Drivers’ average income
$106,787

I 94 is one of the more congested roads here: trips take 53% longer than at free-flow speed, against 11% county-wide.

2WI 35Motorway · 20,144vehicles1,691trucks · 8.4%
Road class
Motorway
Congestion ratio
24.0%
Median trip time
29.7 min
Drivers’ median age
45.2 yrs
Drivers’ average income
$95,937

WI 35 carries 5.2 times the county average on its busiest stretch, where the median trip lasts 29.7 minutes.

3WI 35 / WI 64Motorway · 16,874vehicles1,627trucks · 9.6%
Road class
Motorway
Congestion ratio
19.7%
Median trip time
33.4 min
Drivers’ median age
50.0 yrs
Drivers’ average income
$100,899

At 4.3 times the county average, WI 35 / WI 64 draws drivers from neighborhoods averaging $100,899 in household income.

4WI 64Trunk road · 16,432vehicles1,320trucks · 8.0%
Road class
Trunk road
Median trip time
37.3 min
Drivers’ median age
48.9 yrs
Drivers’ average income
$99,088

The busiest stretch of WI 64 carries 4.2 times the county average; trucks are 8.0% of it, below the county-wide 13.6%.

5WI 35/65Trunk road · 13,952vehicles909trucks · 6.5%
Road class
Trunk road
Median trip time
27.4 min
Drivers’ median age
44.9 yrs
Drivers’ average income
$93,332

On its busiest stretch, WI 35/65 carries 3.6 times the county average; trucks are 6.5% of it, below the county-wide 13.6%.

Ranked by trucks per day

Cars and light vehiclesTrucks
1I 94Motorway · #1 by traffic71,874vehicles9,748trucks · 13.6%
2WI 35Motorway · #2 by traffic20,144vehicles1,691trucks · 8.4%
3WI 35 / WI 64Motorway · #3 by traffic16,874vehicles1,627trucks · 9.6%
4WI 64Trunk road · #4 by traffic16,432vehicles1,320trucks · 8.0%
5Knowles AvenuePrimary road · 12,799vehicles1,018trucks · 8.0%
Road class
Primary road
Congestion ratio
29.9%
Median trip time
30.6 min
Drivers’ median age
47.9 yrs
Drivers’ average income
$97,217

Delays build on Knowles Avenue: its congestion ratio of 30% over free-flow time is well above the county's 11%.

How to read these road counts
  • The first number is AADT, annual average daily traffic: the vehicles passing a point on an average day, both directions combined and trucks included. On a divided highway both carriageways are added together.
  • Traffic changes along a road, with more near interchanges and towns and less in open country. Every figure for a road describes its busiest stretch in the county, so the two rankings show the same numbers for the same road.
  • The second number is the trucks on that stretch, a part of its AADT. The bar splits the AADT into cars and light vehicles (blue) and trucks (amber).
  • See segment-level AADT for any road on TrafficZoom.

Data Sources & Methodology

The data presented on this page is derived from TrafficZoom's proprietary analytics platform, which aggregates and normalizes information from multiple sources, including:

Mobile device location data (anonymized and aggregated)

Road sensor networks and traffic counters

Historical traffic pattern databases

Public traffic count programs published by the

St. CroixDepartment of Transportation

Demographic Baseline for O-D Modeling

U.S. Census Bureau
All metrics represent estimates based on statistical modeling and are intended for strategic planning purposes.
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Data current as of:
Q3 2026

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Counties near St. Croix County

The same traffic breakdown for the areas closest to St. Croix County, Wisconsin.

Need segment-level traffic data?

Identify traffic patterns street by street and analyze the exact corridors that matter to your project.