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Traffic heat map of Grant County, Wisconsin: 558 miles of roads shaded from blue (light) to red (heavy traffic), busiest on Great River Road and Water Street

Grant County, Wisconsin Traffic Counts

How busy are the roads of Grant County, Wisconsin? We measure 558 road miles, divided into 5,680 segments, with multi-sourced, cross-verified mobile and sensor data. Its busiest road, Great River Road, carries 18,709 vehicles a day, 8.1 times the average road. The breakdown below covers volume, trucks, congestion and driver profiles for retailers, logistics planners and engineers.
Data sourced from TrafficZoom's proprietary analytics platform.
Data current as of:
Q3 2026
Updated:
September 29, 2026
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total traffic icon

Total Traffic Volume & Performance in Grant County, Wisconsin

Traffic

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

vehicles per day2,304
Trucks

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

11.2%
Average travel time

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

33.1 min
Congestion ratio

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

9.1%
Drivers’ average age

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

44.7 yrs
Drivers’ average income

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

$68,280

A typical monitored road in Grant County, Wisconsin sees 2,304 vehicles per day, while its 558 miles of monitored roads together handle 1,101,479 vehicle-miles traveled per day (≈402 million per year). Trucks are 11.2% of traffic, close to the 10.2% across Wisconsin.

Traffic 39% below the Wisconsin average

At 2,304 vehicles per day, the average monitored road in Grant carries 39% less traffic than the state average of 3,802, suggesting less demand on each road - less drive-by exposure for retail, but easier access for deliveries. Network-wide, Grant accounts for about 0.8% of Wisconsin's statewide total of vehicle-miles. 51% of counties in Wisconsin see more traffic than Grant's 2,304 vehicles per day.

The average trip takes 33.1 minutes, on par with the state level. 62% of counties in Wisconsin have a shorter average travel time than Grant's 33.1 minutes.

Congestion runs 28% lower than the state level, at a ratio of 9.1%, which means smoother traffic flow - travel times are easy to plan around for scheduled deliveries.

Highway vs. Non-Highway Traffic Analysis

highway traffic icon

Highway Traffic in Grant County, Wisconsin

Trafficvehicles per day5,109
Trucks15.8%
Average travel time40.5 min
Congestion ratio13.2%
Drivers’ average age44.8 yrs
Drivers’ average income$70,065

Highways carry a significant share of travel in Grant County, Wisconsin: 40% of all vehicle-miles. The average highway carries 5,109 vehicles per day, 168% more than the average non-highway road in the same area, which carries 1,910 vehicles per day.

With 16% of the road miles (87 miles in 701 segments), highways punch above their length, carrying 439,892 vehicle-miles traveled per day (≈161 million per year).

Higher highway truck share than 72% of counties in Wisconsin

At 15.8%, highway truck share is 7% higher than the state average. The highway traffic mix is typical for Wisconsin: neither freight- nor commuter-dominated.

72% of counties in Wisconsin see a lower highway truck share than Grant's 15.8%. 68% of counties in Wisconsin see more highway trucks per day than Grant's roughly 807.

non-highway traffic icon

Non-highway Traffic in Grant County, Wisconsin

Trafficvehicles per day1,910
Trucks8.1%
Average travel time32.1 min
Congestion ratio8.5%
Drivers’ average age44.6 yrs
Drivers’ average income$67,418

Local roads carry more than half of all travel in Grant County, Wisconsin (60% of vehicle-miles). On the average non-highway road, that comes to 1,910 vehicles per day.

Local roads make up 84% of the monitored road miles (471 miles in 4,979 segments) but carry less than their share of travel: 661,587 vehicle-miles traveled per day (≈241 million per year). About 1 in 12 vehicles on non-highway roads is a truck (8.1%).

Younger drivers than 96% of counties in Wisconsin

Compared to highways, non-highway routes see 49% fewer trucks by share.

Non-highway congestion (8.5%) runs 30% lower than the state average, pointing to smoother local traffic flow.

68% of counties in Wisconsin see higher average driver income among trip origins than Grant. Grant's median driver age is lower than 96% of counties in Wisconsin.

Time-of-Day & Seasonal Patterns

peak hours icon
Peak Traffic Windows
Weekday peaks:
AM peak 7:00 AM–8:00 AM and a long afternoon plateau from 3:00 PM to 7:00 PM, with volumes reaching approximately 75% higher than the daily average.
Weekend traffic:
Weekends are somewhat quieter: volumes run about 12% 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 -20% versus the annual average - the usual winter low.

Data Finding: Hourly & Seasonal Patterns

In Grant County, Wisconsin, the peak hour concentrates about 7% of the day's traffic, and there is a strong seasonal swing of +11% in high season.

Grant County vs. Wisconsin Traffic Comparison

Of the four measures, average daily traffic per road differs most: Grant County runs 39% below the Wisconsin average.

MetricGrant CountyWisconsin averageDifference
Traffic2,3043,802-39.4%
Truck % (Total Traffic)11.2%10.2%+9.9%
Truck % (Highway)15.8%14.7%+7.4%
Avg. Travel Time33.1 min32.2 min+3.0%

How Grant County compares

Grant County against nearby counties

Grant 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.

Grant 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
Grant County2,30411.2%1,101,47933.1 min9.1%
Dubuque County, Iowa3,7919.5%1,911,04632.1 min14.8%
Crawford County, Wisconsin1,9109.6%356,79032.6 min6.6%
Clayton County, Iowa1,3509.2%421,97037.6 min6.8%
Iowa County, Wisconsin1,67210.2%842,61337.5 min6.9%
Wisconsin average3,80210.2%N/A32.2 min12.6%

Grant County ranked within Wisconsin

Average driver age places Grant County #69 of 72 in Wisconsin - the bottom quarter of the state.

Grant County ranked among 72 county-level areas in Wisconsin (1 = highest); measures without data in every county rank a smaller field, down to 58.
MeasureGrant CountyWisconsin rank
Traffic volume (AADT)2,304#37 of 72
Highway vehicle-miles per day439,892#38 of 58
Truck share on highways15.8%#17 of 58
Highway trucks per day807#40 of 58
Average travel time33.1 min#28 of 72
Average driver income$68,280#49 of 72
Average driver age44.7 yrs#69 of 72

Grant County ranks #17 of 58 on truck share on highways but #69 of 72 on average driver age - the two describe the same roads and are worth reading together rather than either on its own.

Busiest roads in Grant County, Wisconsin

The three busiest roads in Grant County average 14,045 vehicles a day, 6.1 times the county average of 2,304 across all its monitored roads.

Great River Road is the busiest road, at 18,709 vehicles a day, 3,155 of them trucks (16.9%). It also carries the most trucks.

Trips using US 151 are long: a median of 49.8 minutes against 33.1 county-wide, the mark of a through route.

Freight stands out on Main Street and Elm Street: trucks are 17.7% and 17.2% of the traffic there, against 11.2% county-wide.

Ranked by daily traffic (AADT)

Cars and light vehiclesTrucks
1Great River RoadTrunk road · 18,709vehicles3,155trucks · 16.9%
Road class
Trunk road
Median trip time
36.8 min
Drivers’ median age
44.1 yrs
Drivers’ average income
$74,548

A freight route: trucks are 16.9% of the traffic on Great River Road's busiest stretch, 1.5 times the county-wide 11.2%.

2Water StreetPrimary road · 12,886vehicles826trucks · 6.4%
Road class
Primary road
Congestion ratio
37.2%
Median trip time
29.8 min
Drivers’ median age
44.5 yrs
Drivers’ average income
$58,603

Travel on Water Street's busiest stretch runs 37% over free-flow time, against 9% across the county, so expect slower peak hours.

3Dubuque-Wisconsin BridgeMotorway · 10,541vehicles1,783trucks · 16.9%
Road class
Motorway
Median trip time
42.2 min
Drivers’ median age
46.0 yrs
Drivers’ average income
$74,152

Trucks make up 16.9% of Dubuque-Wisconsin Bridge's traffic, against 11.2% across the county, so freight weighs heavily here.

4US 151Trunk road · 9,597vehicles1,358trucks · 14.2%
Road class
Trunk road
Congestion ratio
10.2%
Median trip time
49.8 min
Drivers’ median age
40.5 yrs
Drivers’ average income
$65,067

On its busiest stretch, US 151 carries 4.2 times the county average; trucks are 14.2% of it, above the county-wide 11.2%.

5Business Highway 151Secondary road · 8,141vehicles380trucks · 4.7%
Road class
Secondary road
Congestion ratio
25.1%
Median trip time
28.3 min
Drivers’ median age
44.5 yrs
Drivers’ average income
$59,408

Business Highway 151 is one of the more congested roads here: trips take 25% longer than at free-flow speed, against 9% county-wide.

Ranked by trucks per day

Cars and light vehiclesTrucks
1Great River RoadTrunk road · #1 by traffic18,709vehicles3,155trucks · 16.9%
2Dubuque-Wisconsin BridgeMotorway · #3 by traffic10,541vehicles1,783trucks · 16.9%
3Main StreetTrunk road · 7,954vehicles1,405trucks · 17.7%
Road class
Trunk road
Congestion ratio
24.3%
Median trip time
40.2 min
Drivers’ median age
49.9 yrs
Drivers’ average income
$74,569

Main Street peaks at 7,954 vehicles a day, 3.5 times the county average; trucks are 17.7% of it, above the county-wide 11.2%.

4US 151Trunk road · #4 by traffic9,597vehicles1,358trucks · 14.2%
5Elm StreetTrunk road · 5,103vehicles878trucks · 17.2%
Road class
Trunk road
Congestion ratio
14.0%
Median trip time
39.9 min
Drivers’ median age
45.7 yrs
Drivers’ average income
$61,535

Elm Street carries 2.2 times the county average at its busiest, 878 of them trucks (17.2%, above the county-wide 11.2%).

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

GrantDepartment 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 Grant County

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

Need segment-level traffic data?

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