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Traffic heat map of Black Hawk County, Iowa: 706 miles of roads shaded from blue (light) to red (heavy traffic), busiest on Washington Street and I 380

Black Hawk County, Iowa Traffic Counts

TrafficZoom tracks traffic on 706 road miles in Black Hawk County, Iowa, divided into 9,350 segments averaging 398 ft. Its busiest road, Washington Street, carries 28,460 vehicles a day, 8.0 times the average road. Built from cross-verified mobile and road-sensor data, these counts help you size up a retail site, plan logistics routes or assess infrastructure needs.
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 Black Hawk County, Iowa

Traffic

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

vehicles per day3,561
Trucks

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

9.1%
Average travel time

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

33.8 min
Congestion ratio

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

10.6%
Drivers’ average age

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

44.2 yrs
Drivers’ average income

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

$78,556

A typical monitored road in Black Hawk County, Iowa sees 3,561 vehicles per day, while its 706 miles of monitored roads together handle 2,621,516 vehicle-miles traveled per day (≈957 million per year). Trucks are a smaller part of the mix than across Iowa: 9.1% against 11.0%.

Busier roads than 91% of counties in Iowa

Black Hawk sees 17% higher average daily traffic volume than the state average (3,561 vehicles per day against 3,042), suggesting more demand on each road - a critical factor for logistics and site planning. Network-wide, Black Hawk accounts for about 3.1% of Iowa's statewide total of vehicle-miles. 91% of counties in Iowa see less traffic than Black Hawk's 3,561 vehicles per day.

The average trip takes 33.8 minutes, on par with the state level. Its average travel time of 33.8 minutes is longer than 55% of counties in Iowa.

Congestion is somewhat lower than the state level, at a ratio of 10.6% (7% lower).

Highway vs. Non-Highway Traffic Analysis

highway traffic icon

Highway Traffic in Black Hawk County, Iowa

Trafficvehicles per day8,617
Trucks13.0%
Average travel time38.5 min
Congestion ratio15.8%
Drivers’ average age44.8 yrs
Drivers’ average income$78,603

Highways carry a significant share of travel in Black Hawk County, Iowa: 44% of all vehicle-miles. The average highway carries 8,617 vehicles per day, 161% more than the average non-highway road in the same area, which carries 3,299 vehicles per day.

Highways make up 20% of the monitored road miles (139 miles, 460 segments), so they carry more than their share: 1,145,693 vehicle-miles traveled per day (≈418 million per year).

That is more highway travel volume than 90% of counties in Iowa.

Lower highway truck share than 70% of counties in Iowa

At 13.0%, highway truck share is 19% lower than the state average. Highways here mostly serve passenger trips, so local access matters more than long-haul routing for logistics operators.

By truck concentration, highways here trail 70% of counties in Iowa. By raw truck volume, Black Hawk carries more highway trucks than 64% of counties in Iowa.

non-highway traffic icon

Non-highway Traffic in Black Hawk County, Iowa

Trafficvehicles per day3,299
Trucks6.1%
Average travel time33.5 min
Congestion ratio10.4%
Drivers’ average age44.0 yrs
Drivers’ average income$78,528

A little more than half of the driving in Black Hawk County, Iowa happens on local roads: 56% of all vehicle-miles. A typical local road sees 3,299 vehicles per day.

Spread over 567 miles and 8,890 segments, 80% of the road network, local roads carry a lighter load per mile: 1,475,823 vehicle-miles traveled per day (≈539 million per year). About 1 in 16 vehicles on non-highway roads is a truck (6.1%).

Younger drivers than 94% of counties in Iowa

Compared to highways, non-highway routes see 53% fewer trucks by share.

Non-highway congestion (10.4%) runs slightly lower than the state level (7% lower).

70% of counties in Iowa see lower average driver income among trip origins than Black Hawk. 94% of counties in Iowa have an older driver population than Black Hawk.

Time-of-Day & Seasonal Patterns

peak hours icon
Peak Traffic Windows
Weekday peaks:
AM peak 9:00 AM–12:00 PM and a long afternoon plateau from 3:00 PM to 7:00 PM, with volumes reaching approximately 67% higher than the daily average.
Weekend traffic:
Weekends are somewhat quieter: volumes run about 18% below weekday levels, the usual weekend dip.
seasonal traffic icon
Seasonal Fluctuation
Busy season:
August–October is the high season, with volumes +8% 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 Black Hawk County, Iowa, the peak hour concentrates about 7% of the day's traffic, and there is a noticeable seasonal swing of +8% in high season.

Black Hawk County vs. Iowa Traffic Comparison

Of the four measures, highway truck share differs most: Black Hawk County runs 19% below the Iowa average. Its truck share is also 17% below.

MetricBlack Hawk CountyIowa averageDifference
Traffic3,5613,042+17.1%
Truck % (Total Traffic)9.1%11.0%-17.2%
Truck % (Highway)13.0%16.1%-19.1%
Avg. Travel Time33.8 min33.0 min+2.3%

How Black Hawk County compares

Black Hawk County moves more traffic than any nearby county

Against the 4 nearest areas, Black Hawk County moves 4.1 times the total daily travel and carries 108.6% more traffic on a typical road; it has the busiest roads of the five. It is where traffic concentrates in this corner of the map - the local bottleneck, with more vehicles per road AND less room to absorb them.

Black Hawk 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
Black Hawk County3,5619.1%2,621,51633.8 min10.6%
Bremer County, Iowa1,9089.5%703,34330.9 min7.8%
Buchanan County, Iowa2,25911.5%938,19333.5 min9.1%
Grundy County, Iowa1,45712.6%588,70432.8 min5.6%
Fayette County, Iowa1,2039.1%346,06632.5 min5.6%
Iowa average3,04211.0%N/A33.0 min11.4%

Black Hawk County ranked within Iowa

Average driver age places Black Hawk County #93 of 99 in Iowa - the bottom quarter of the state.

Black Hawk County ranked among 99 county-level areas in Iowa (1 = highest); measures without data in every county rank a smaller field, down to 70.
MeasureBlack Hawk CountyIowa rank
Traffic volume (AADT)3,561#10 of 99
Highway vehicle-miles per day1,145,693#8 of 70
Truck share on highways13.0%#49 of 70
Highway trucks per day1,122#26 of 70
Average travel time33.8 min#45 of 99
Average driver income$78,556#30 of 99
Average driver age44.2 yrs#93 of 99

The two ends of this table sit far apart: #10 of 99 on average daily traffic volume, against #93 of 99 on average driver age.

Busiest roads in Black Hawk County, Iowa

On their busiest stretches, the three busiest roads in Black Hawk County carry 23,679 vehicles a day on average, 6.6 times the typical road in the county (3,561).

Washington Street is the busiest road, at 28,460 vehicles a day, 2,425 of them trucks (8.5%). Avenue of the Saints carries the most trucks, 2,944 a day (15.7% of its traffic), although it ranks #4 for all traffic.

Freight stands out on Avenue of the Saints and Washington Expressway: trucks are 15.7% and 14.7% of the traffic there, against 9.1% county-wide.

18th Street carries longer journeys than most roads here, with a median trip of 46.5 minutes against 33.8 county-wide.

Ranked by daily traffic (AADT)

Cars and light vehiclesTrucks
1Washington StreetTrunk road · 28,460vehicles2,425trucks · 8.5%
Road class
Trunk road
Congestion ratio
20.8%
Median trip time
36.0 min
Drivers’ median age
44.4 yrs
Drivers’ average income
$68,210

Delays build on Washington Street: its congestion ratio of 21% over free-flow time is well above the county's 11%.

2I 380Motorway · 23,179vehicles2,555trucks · 11.0%
Road class
Motorway
Congestion ratio
17.9%
Median trip time
37.7 min
Drivers’ median age
45.3 yrs
Drivers’ average income
$71,251

I 380 carries 6.5 times the county average on its busiest stretch, where the median trip lasts 37.7 minutes.

3Leo P Rooff ExpresswayMotorway · 19,398vehicles2,783trucks · 14.3%
Road class
Motorway
Congestion ratio
15.6%
Median trip time
33.9 min
Drivers’ median age
43.7 yrs
Drivers’ average income
$75,404

A freight route: trucks are 14.3% of the traffic on Leo P Rooff Expressway's busiest stretch, 1.6 times the county-wide 9.1%.

4Avenue of the SaintsMotorway · 18,803vehicles2,944trucks · 15.7%
Road class
Motorway
Congestion ratio
18.6%
Median trip time
45.4 min
Drivers’ median age
45.7 yrs
Drivers’ average income
$81,302

Drivers on Avenue of the Saints are on long journeys, a median 45.4 minutes against 33.8 county-wide: a through route more than a local street.

518th StreetSecondary road · 17,026vehicles749trucks · 4.4%
Road class
Secondary road
Congestion ratio
24.7%
Median trip time
46.5 min
Drivers’ median age
41.0 yrs
Drivers’ average income
$79,316

Travel on 18th Street's busiest stretch runs 25% over free-flow time, against 11% across the county, so expect slower peak hours.

Ranked by trucks per day

Cars and light vehiclesTrucks
1Avenue of the SaintsMotorway · #4 by traffic18,803vehicles2,944trucks · 15.7%
2Leo P Rooff ExpresswayMotorway · #3 by traffic19,398vehicles2,783trucks · 14.3%
3I 380Motorway · #2 by traffic23,179vehicles2,555trucks · 11.0%
4Washington StreetTrunk road · #1 by traffic28,460vehicles2,425trucks · 8.5%
5Washington ExpresswayMotorway · 12,604vehicles1,856trucks · 14.7%
Road class
Motorway
Congestion ratio
18.5%
Median trip time
39.6 min
Drivers’ median age
43.7 yrs
Drivers’ average income
$71,536

On its busiest stretch, Washington Expressway carries 3.5 times the county average; trucks are 14.7% of it, above the county-wide 9.1%.

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

Black HawkDepartment 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 Black Hawk County

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

Need segment-level traffic data?

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