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Traffic heat map of Harrison County, Iowa: 328 miles of roads shaded from blue (light) to red (heavy traffic), busiest on I 29 and Erie Street

Harrison County, Iowa Traffic Counts

Traffic analytics for Harrison County, Iowa, calculated from real-world mobile and sensor networks on 2,179 road segments (328 road miles, about 794 ft each). Its busiest road, I 29, carries 15,490 vehicles a day, 7.6 times the average road. Use the figures below to move from assumptions to certainty on retail locations, logistics and road planning.
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 Harrison County, Iowa

Traffic

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

vehicles per day2,050
Trucks

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

15.4%
Average travel time

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

35.6 min
Drivers’ average age

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

50.0 yrs
Drivers’ average income

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

$79,841

Our data shows 2,050 vehicles per day on the average road in Harrison County, Iowa, and 854,649 vehicle-miles traveled per day (≈312 million per year) across its 328 miles of monitored roads. At 15.4%, the truck share runs above the 11.0% across Iowa: about 1 in 7 vehicles.

Longer trips than 76% of counties in Iowa

Harrison sees 33% lower average daily traffic volume than the state average (2,050 vehicles per day against 3,042), suggesting less demand on each road - less drive-by exposure for retail, but easier access for deliveries. In total volume terms, its road network carries about 1.0% of Iowa's statewide total of vehicle-miles. Harrison carries more traffic than 68% of counties in Iowa.

The average trip takes 35.6 minutes, 8% higher than the state level. On travel time, Harrison runs longer than 76% of counties in Iowa.

Highway vs. Non-Highway Traffic Analysis

highway traffic icon

Highway Traffic in Harrison County, Iowa

Trafficvehicles per day5,236
Trucks19.9%
Average travel time60.1 min
Drivers’ average age48.9 yrs
Drivers’ average income$80,122

A little more than half of the driving in Harrison County, Iowa happens on highways: 62% of all vehicle-miles. The average highway carries 5,236 vehicles per day, 184% more than the average non-highway road in the same area, which carries 1,846 vehicles per day.

With 23% of the road miles (74 miles in 131 segments), highways punch above their length, carrying 531,797 vehicle-miles traveled per day (≈194 million per year).

That is more highway travel volume than 75% of counties in Iowa.

Higher highway truck share than 75% of counties in Iowa

At 19.9%, highway truck share is 24% higher than the state average. Highways here lean toward freight, so highway access is a real asset for logistics operators.

By truck concentration, highways here outrank 75% of counties in Iowa. 71% of counties in Iowa see fewer highway trucks per day than Harrison's roughly 1,042.

non-highway traffic icon

Non-highway Traffic in Harrison County, Iowa

Trafficvehicles per day1,846
Trucks7.9%
Average travel time34.0 min
Drivers’ average age50.5 yrs
Drivers’ average income$79,696

Local roads carry a significant share of travel in Harrison County, Iowa: 38% of all vehicle-miles. A typical local road sees 1,846 vehicles per day.

Local roads make up 77% of the monitored road miles (254 miles in 2,048 segments) but carry less than their share of travel: 322,852 vehicle-miles traveled per day (≈118 million per year). Trucks make up 7.9% of non-highway traffic, about 1 in 13 vehicles.

Drivers from higher-income areas than 79% of counties in Iowa

Non-highway roads carry a truck concentration that's 60% lower than the highway network.

Trip origins here have higher average income than 79% of counties in Iowa. Harrison's median driver age is lower than 55% of counties in Iowa.

Time-of-Day & Seasonal Patterns

Data Finding: Hourly & Seasonal Patterns

In Harrison County, Iowa, the peak hour concentrates about 8% of the day's traffic.

Harrison County vs. Iowa Traffic Comparison

The truck share sets Harrison County apart: 40% above the Iowa average. Its average daily traffic per road, by contrast, is 33% below.

MetricHarrison CountyIowa averageDifference
Traffic2,0503,042-32.6%
Truck % (Total Traffic)15.4%11.0%+39.6%
Truck % (Highway)19.9%16.1%+23.6%
Avg. Travel Time35.6 min33.0 min+7.8%

How Harrison County compares

Harrison County moves more traffic than any nearby county

Against the 4 nearest areas, Harrison County moves 2.3 times the total daily travel; it has the second busiest roads of the five. It is bigger rather than busier: the extra travel comes from carrying more road, not from heavier roads.

Harrison 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
Harrison County2,05015.4%854,64935.6 minN/A
Monona County, Iowa1,35817.4%580,32034.0 min11.1%
Washington County, Nebraska3,1157.7%447,03731.2 minN/A
Shelby County, Iowa1,3809.2%250,65132.9 minN/A
Burt County, Nebraska1,5858.9%184,47033.0 minN/A
Iowa average3,04211.0%N/A33.0 min11.4%

Harrison County ranked within Iowa

Harrison County sits in the top quarter of the Iowa field on average driver income, at #22 of 99.

Harrison County ranked among 99 county-level areas in Iowa (1 = highest); measures without data in every county rank a smaller field, down to 70.
MeasureHarrison CountyIowa rank
Traffic volume (AADT)2,050#32 of 99
Highway vehicle-miles per day531,797#18 of 70
Truck share on highways19.9%#18 of 70
Highway trucks per day1,042#21 of 70
Average travel time35.6 min#25 of 99
Average driver income$79,841#22 of 99
Average driver age50.0 yrs#55 of 99

Busiest roads in Harrison County, Iowa

On their busiest stretches, the three busiest roads in Harrison County carry 13,301 vehicles a day on average, 6.5 times the typical road in the county (2,050).

I 29 leads with 15,490 vehicles a day, 3,154 of them trucks (20.4%). It tops the truck ranking too, with the most trucks.

I 29 carries longer journeys than most roads here, with a median trip of 61.8 minutes against 35.6 county-wide.

Erie Street is busy with cars rather than freight: only 5.6% of its traffic is trucks, against 15.4% county-wide.

Ranked by daily traffic (AADT)

Cars and light vehiclesTrucks
1I 29Motorway · 15,490vehicles3,154trucks · 20.4%
Road class
Motorway
Median trip time
61.8 min
Drivers’ median age
48.6 yrs
Drivers’ average income
$80,183

I 29 carries 7.6 times the county average on its busiest stretch, where the median trip lasts 61.8 minutes.

2Erie StreetPrimary road · 13,398vehicles756trucks · 5.6%
Road class
Primary road
Median trip time
32.8 min
Drivers’ median age
50.5 yrs
Drivers’ average income
$77,912

At 6.5 times the county average, Erie Street draws drivers from neighborhoods averaging $77,912 in household income.

3Lincoln HighwayPrimary road · 11,015vehicles671trucks · 6.1%
Road class
Primary road
Median trip time
34.2 min
Drivers’ median age
50.9 yrs
Drivers’ average income
$82,055

A main artery: Lincoln Highway's busiest stretch carries 5.4 times the county average; trucks are 6.1% of it, below the county-wide 15.4%.

4US 30Primary road · 6,653vehicles568trucks · 8.5%
Road class
Primary road
Median trip time
38.4 min
Drivers’ median age
50.4 yrs
Drivers’ average income
$82,472

US 30 peaks at 6,653 vehicles a day, 3.2 times the county average; trucks are 8.5% of it, below the county-wide 15.4%.

5Maple AvenuePrimary road · 6,353vehicles588trucks · 9.3%
Road class
Primary road
Median trip time
39.4 min
Drivers’ median age
51.0 yrs
Drivers’ average income
$82,785

Maple Avenue carries 3.1 times the county average at its busiest, 588 of them trucks (9.3%, below the county-wide 15.4%).

Ranked by trucks per day

Cars and light vehiclesTrucks
1I 29Motorway · #1 by traffic15,490vehicles3,154trucks · 20.4%
2Erie StreetPrimary road · #2 by traffic13,398vehicles756trucks · 5.6%
3Lincoln HighwayPrimary road · #3 by traffic11,015vehicles671trucks · 6.1%
47th StreetPrimary road · 6,326vehicles593trucks · 9.4%
Road class
Primary road
Median trip time
37.1 min
Drivers’ median age
50.7 yrs
Drivers’ average income
$82,825

7th Street carries 3.1 times the county average on its busiest stretch, where the median trip lasts 37.1 minutes.

5Maple AvenuePrimary road · #5 by traffic6,353vehicles588trucks · 9.3%
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

HarrisonDepartment 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 Harrison County

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

Need segment-level traffic data?

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