Need segment-level traffic data?

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

Get insights →
Traffic heat map of Clayton County, Iowa: 334 miles of roads shaded from blue (light) to red (heavy traffic), busiest on US 18 and 5th Street

Clayton County, Iowa Traffic Counts

Its busiest road, US 18, carries 5,176 vehicles a day, 3.8 times the average road. This page breaks down traffic in Clayton County, Iowa across 334 miles of monitored roads split into 2,420 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
Find my place
total traffic icon

Total Traffic Volume & Performance in Clayton County, Iowa

Traffic

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

vehicles per day1,350
Trucks

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

9.2%
Average travel time

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

37.6 min
Congestion ratio

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

6.8%
Drivers’ average age

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

53.2 yrs
Drivers’ average income

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

$63,497

The average monitored road in Clayton County, Iowa carries 1,350 vehicles per day. Across its 334 miles of monitored roads, that adds up to 421,970 vehicle-miles traveled per day (≈154 million per year). About 1 in 11 vehicles is a truck, fewer than the 1 in 9 across Iowa.

Longer trips than 84% of counties in Iowa

Clayton sees 56% lower average daily traffic volume than the state average (1,350 vehicles per day against 3,042), suggesting less demand on each road - quiet roads that suit freight movement more than drive-by retail. Network-wide, Clayton accounts for about 0.5% of Iowa's statewide total of vehicle-miles. 71% of counties in Iowa see more traffic than Clayton's 1,350 vehicles per day.

Journey times run 14% higher than the state level, at 37.6 minutes on average. 84% of counties in Iowa have a shorter average travel time than Clayton's 37.6 minutes.

At 40% lower than the state level, the 6.8% congestion ratio signals smoother traffic flow - fewer delays make delivery windows more reliable.

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 81% higher than the daily average.
Weekend traffic:
Weekends are much quieter: volumes run about 24% below weekday levels, the signature of a commute-driven road network.
seasonal traffic icon
Seasonal Fluctuation
Busy season:
May–July is the high season, with volumes +11% versus the annual average.
Lowest month:
February is the quietest month, with volumes -17% versus the annual average - the usual winter low.

Data Finding: Hourly & Seasonal Patterns

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

Clayton County vs. Iowa Traffic Comparison

Of the four measures, average daily traffic per road differs most: Clayton County runs 56% below the Iowa average. Its truck share is also 17% below.

MetricClayton CountyIowa averageDifference
Traffic1,3503,042-55.6%
Truck % (Total Traffic)9.2%11.0%-16.5%
Avg. Travel Time37.6 min33.0 min+14.0%

How Clayton County compares

Trips in Clayton County run longer than in any nearby county

Nothing in this table sets Clayton County sharply apart from the 4 areas nearest to it, though it has the fourth busiest roads of the five. Quiet roads and long journeys - a rural pattern, where the distance between destinations rather than the traffic on the way is what takes the time.

Clayton County and the 4 nearest county-level areas by centroid distance, with the Iowa average for scale.
AreaAverage daily trafficTruck shareDaily vehicle-milesAverage travel timeCongestion ratio
Clayton County1,3509.2%421,97037.6 min6.8%
Delaware County, Iowa1,48611.3%611,00331.5 min6.9%
Fayette County, Iowa1,2039.1%346,06632.5 min5.6%
Grant County, Wisconsin2,30411.2%1,101,47933.1 min9.1%
Buchanan County, Iowa2,25911.5%938,19333.5 min9.1%
Iowa average3,04211.0%N/A33.0 min11.4%

Clayton County ranked within Iowa

Clayton County sits in the top quarter of the Iowa field on average driver age, at #5 of 99.

Clayton County ranked among 99 county-level areas in Iowa (1 = highest).
MeasureClayton CountyIowa rank
Traffic volume (AADT)1,350#71 of 99
Average travel time37.6 min#17 of 99
Average driver income$63,497#93 of 99
Average driver age53.2 yrs#5 of 99

Clayton County ranks #5 of 99 on average driver age but #93 of 99 on average driver income. The driver population here skews older and lower-income than most of Iowa.

Busiest roads in Clayton County, Iowa

Traffic concentrates on a few corridors: the three busiest roads average 4,639 vehicles a day, against 1,350 on the average road in Clayton County.

US 18 leads with 5,176 vehicles a day, 491 of them trucks (9.5%). It also carries the most trucks.

River Street is a local road at heart: the median trip using it lasts 25.8 minutes, against 37.6 for the county.

Ranked by daily traffic (AADT)

Cars and light vehiclesTrucks
1US 18Primary road · 5,176vehicles491trucks · 9.5%
Road class
Primary road
Congestion ratio
11.8%
Median trip time
33.2 min
Drivers’ median age
51.8 yrs
Drivers’ average income
$60,309

On its busiest stretch, US 18 carries 3.8 times the county average; trucks are 9.5% of it, in line with the county-wide 9.2%.

25th StreetPrimary road · 4,955vehicles346trucks · 7.0%
Road class
Primary road
Congestion ratio
14.3%
Median trip time
38.0 min
Drivers’ median age
52.2 yrs
Drivers’ average income
$60,615

5th Street peaks at 4,955 vehicles a day, 3.7 times the county average; trucks are 7.0% of it, below the county-wide 9.2%.

3Mission StreetPrimary road · 3,785vehicles456trucks · 12.0%
Road class
Primary road
Congestion ratio
8.9%
Median trip time
39.7 min
Drivers’ median age
53.3 yrs
Drivers’ average income
$64,180

Mission Street carries 2.8 times the county average at its busiest, 456 of them trucks (12.0%, above the county-wide 9.2%).

4Great River RoadPrimary road · 3,530vehicles249trucks · 7.0%
Road class
Primary road
Congestion ratio
8.2%
Median trip time
25.9 min
Drivers’ median age
56.5 yrs
Drivers’ average income
$55,539

Trips on Great River Road are short, a median 25.9 minutes against 37.6 county-wide, so it mostly serves local errands and commutes.

5River StreetPrimary road · 3,344vehicles248trucks · 7.4%
Road class
Primary road
Congestion ratio
8.0%
Median trip time
25.8 min
Drivers’ median age
56.2 yrs
Drivers’ average income
$56,130

River Street carries 2.5 times the county average on its busiest stretch, where the median trip lasts 25.8 minutes.

Ranked by trucks per day

Cars and light vehiclesTrucks
1US 18Primary road · #1 by traffic5,176vehicles491trucks · 9.5%
2Mission StreetPrimary road · #3 by traffic3,785vehicles456trucks · 12.0%
3Commercial StreetPrimary road · 3,034vehicles412trucks · 13.6%
Road class
Primary road
Congestion ratio
9.9%
Median trip time
42.5 min
Drivers’ median age
52.7 yrs
Drivers’ average income
$67,651

At 2.2 times the county average, Commercial Street draws drivers from neighborhoods averaging $67,651 in household income.

45th StreetPrimary road · #2 by traffic4,955vehicles346trucks · 7.0%
5IA 13Primary road · 2,778vehicles339trucks · 12.2%
Road class
Primary road
Congestion ratio
6.2%
Median trip time
45.5 min
Drivers’ median age
52.9 yrs
Drivers’ average income
$68,692

The busiest stretch of IA 13 carries 2.1 times the county average; trucks are 12.2% of it, above the county-wide 9.2%.

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

ClaytonDepartment 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.
link arrow icon
Data current as of:
Q3 2026

Explore further

TrafficZoom platform

— street-level analytics and custom corridor reports.

Map AI

— demographics, housing and mobility data.

Counties near Clayton County

The same traffic breakdown for the areas closest to Clayton County, Iowa.

Need segment-level traffic data?

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