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Traffic heat map of Tama County, Iowa: 318 miles of roads shaded from blue (light) to red (heavy traffic), busiest on Lincoln Highway and County Road

Tama County, Iowa Traffic Counts

Trips here are among the 3 longest of any county in Iowa. This page breaks down traffic in Tama County, Iowa across 318 miles of monitored roads split into 3,042 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 Tama County, Iowa

Traffic

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

vehicles per day1,382
Trucks

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

11.0%
Average travel time

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

42.3 min
Congestion ratio

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

5.6%
Drivers’ average age

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

49.5 yrs
Drivers’ average income

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

$71,125

A typical monitored road in Tama County, Iowa sees 1,382 vehicles per day, while its 318 miles of monitored roads together handle 485,325 vehicle-miles traveled per day (≈177 million per year). Trucks are 11.0% of traffic, close to the 11.0% across Iowa.

Longer trips than 98% of counties in Iowa

At 1,382 vehicles per day, the average monitored road in Tama carries 55% less traffic than the state average of 3,042, suggesting less demand on each road - very light roads: easy truck access, but little passing trade for roadside retail. Network-wide, Tama accounts for about 0.6% of Iowa's statewide total of vehicle-miles. 65% of counties in Iowa see more traffic than Tama's 1,382 vehicles per day.

The average trip takes 42.3 minutes, 28% higher than the state level. Its average travel time of 42.3 minutes is longer than 98% of counties in Iowa.

At 51% lower than the state level, the 5.6% congestion ratio signals smoother traffic flow - free-flowing roads make scheduled deliveries highly predictable.

Highway vs. Non-Highway Traffic Analysis

highway traffic icon

Highway Traffic in Tama County, Iowa

Trafficvehicles per day3,825
Trucks13.3%
Average travel time56.5 min
Congestion ratio8.8%
Drivers’ average age48.3 yrs
Drivers’ average income$69,963

Highways carry a significant share of travel in Tama County, Iowa: 40% of all vehicle-miles. The average highway carries 3,825 vehicles per day, 206% more than the average non-highway road in the same area, which carries 1,249 vehicles per day.

With 16% of the road miles (50 miles in 157 segments), highways punch above their length, carrying 192,490 vehicle-miles traveled per day (≈70.3 million per year).

Fewer highway trucks than 72% of counties in Iowa

Highway truck concentration here runs 17% lower than the state average, at 13.3%. Highways here mostly serve passenger trips, so local access matters more than long-haul routing for logistics operators.

By truck concentration, highways here trail 67% of counties in Iowa. Tama's highway truck count is lower than 72% of counties in Iowa, at roughly 509 trucks per day.

non-highway traffic icon

Non-highway Traffic in Tama County, Iowa

Trafficvehicles per day1,249
Trucks9.5%
Average travel time41.5 min
Congestion ratio5.4%
Drivers’ average age50.5 yrs
Drivers’ average income$71,674

Local roads carry more than half of all travel in Tama County, Iowa (60% of vehicle-miles). A typical local road sees 1,249 vehicles per day.

Local roads make up 84% of the monitored road miles (268 miles in 2,885 segments) but carry less than their share of travel: 292,835 vehicle-miles traveled per day (≈107 million per year). The truck share on non-highway roads is 9.5%.

Local congestion 52% below the Iowa average

Compared to highways, non-highway routes see 28% fewer trucks by share.

Non-highway congestion (5.4%) runs 52% lower than the state average, pointing to smoother local traffic flow.

57% of counties in Iowa see higher average driver income among trip origins than Tama. The driver population here skews younger than 56% of counties in Iowa.

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 82% higher than the daily average.
Weekend traffic:
Weekends are much quieter: volumes run about 36% below weekday levels, the signature of a commute-driven road network.
seasonal traffic icon
Seasonal Fluctuation
Busy season:
September–November is the high season, with volumes +23% versus the annual average.
Lowest month:
February is the quietest month, with volumes -28% versus the annual average - the usual winter low.

Data Finding: Hourly & Seasonal Patterns

In Tama County, Iowa, the peak hour concentrates about 8% of the day's traffic, and there is a strong seasonal swing of +23% in high season.

Tama County vs. Iowa Traffic Comparison

Tama County's biggest difference from the Iowa average is its average daily traffic per road, 55% below it. Its average travel time, by contrast, is 28% above.

MetricTama CountyIowa averageDifference
Traffic1,3823,042-54.6%
Truck % (Total Traffic)11.0%11.0%+0.2%
Truck % (Highway)13.3%16.1%-17.4%
Avg. Travel Time42.3 min33.0 min+28.1%

How Tama County compares

Tama County moves the least traffic of its nearby counties

Set against the average of the 4 areas nearest to it, Tama County sees 28.8% longer typical trips and carries 29.1% less traffic on a typical road; it has the quietest roads of the five. Trips here run longer without running slower: distance, not congestion, is what drivers spend their time on.

Tama 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
Tama County1,38211.0%485,32542.3 min5.6%
Poweshiek County, Iowa2,00820.4%768,56231.3 min6.7%
Marshall County, Iowa2,4469.3%943,01235.7 min9.3%
Benton County, Iowa1,88110.4%853,92831.4 min6.9%
Grundy County, Iowa1,45712.6%588,70432.8 min5.6%
Iowa average3,04211.0%N/A33.0 min11.4%

Tama County ranked within Iowa

On average travel time, Tama County is among the three highest county-level areas in Iowa.

Tama County ranked among 99 county-level areas in Iowa (1 = highest); measures without data in every county rank a smaller field, down to 70.
MeasureTama CountyIowa rank
Traffic volume (AADT)1,382#65 of 99
Highway vehicle-miles per day192,490#52 of 70
Truck share on highways13.3%#47 of 70
Highway trucks per day509#51 of 70
Average travel time42.3 min#3 of 99
Average driver income$71,125#57 of 99
Average driver age49.5 yrs#56 of 99

Busiest roads in Tama County, Iowa

Traffic concentrates on a few corridors: the three busiest roads average 7,856 vehicles a day, against 1,382 on the average road in Tama County.

Lincoln Highway is the busiest road, at 9,818 vehicles a day, 1,135 of them trucks (11.6%). It tops the truck ranking too, with the most trucks.

Ranked by daily traffic (AADT)

Cars and light vehiclesTrucks
1Lincoln HighwayTrunk road · 9,818vehicles1,135trucks · 11.6%
Road class
Trunk road
Congestion ratio
11.0%
Median trip time
53.8 min
Drivers’ median age
48.7 yrs
Drivers’ average income
$69,737

At 7.1 times the county average, Lincoln Highway draws drivers from neighborhoods averaging $69,737 in household income.

2County RoadPrimary road · 6,962vehicles534trucks · 7.7%
Road class
Primary road
Congestion ratio
7.9%
Median trip time
39.2 min
Drivers’ median age
51.1 yrs
Drivers’ average income
$60,199

A main artery: County Road's busiest stretch carries 5.0 times the county average; trucks are 7.7% of it, below the county-wide 11.0%.

3Harding StreetPrimary road · 6,788vehicles418trucks · 6.2%
Road class
Primary road
Congestion ratio
8.2%
Median trip time
38.4 min
Drivers’ median age
49.9 yrs
Drivers’ average income
$57,599

On its busiest stretch, Harding Street carries 4.9 times the county average; trucks are 6.2% of it, below the county-wide 11.0%.

413th StreetPrimary road · 4,627vehicles292trucks · 6.3%
Road class
Primary road
Congestion ratio
5.5%
Median trip time
40.7 min
Drivers’ median age
50.8 yrs
Drivers’ average income
$58,591

13th Street peaks at 4,627 vehicles a day, 3.3 times the county average; trucks are 6.3% of it, below the county-wide 11.0%.

5State StreetPrimary road · 4,246vehicles277trucks · 6.5%
Road class
Primary road
Congestion ratio
5.1%
Median trip time
49.5 min
Drivers’ median age
50.9 yrs
Drivers’ average income
$59,053

State Street carries 3.1 times the county average at its busiest, 277 of them trucks (6.5%, below the county-wide 11.0%).

Ranked by trucks per day

Cars and light vehiclesTrucks
1Lincoln HighwayTrunk road · #1 by traffic9,818vehicles1,135trucks · 11.6%
2County RoadPrimary road · #2 by traffic6,962vehicles534trucks · 7.7%
3Main StreetPrimary road · 3,862vehicles435trucks · 11.3%
Road class
Primary road
Congestion ratio
6.4%
Median trip time
43.0 min
Drivers’ median age
48.9 yrs
Drivers’ average income
$81,235

Main Street carries 2.8 times the county average on its busiest stretch, where the median trip lasts 43.0 minutes.

4Harding StreetPrimary road · #3 by traffic6,788vehicles418trucks · 6.2%
5County Road D65Primary road · 3,922vehicles401trucks · 10.2%
Road class
Primary road
Congestion ratio
9.1%
Median trip time
45.8 min
Drivers’ median age
48.4 yrs
Drivers’ average income
$81,912

At 2.8 times the county average, County Road D65 draws drivers from neighborhoods averaging $81,912 in household income.

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

TamaDepartment 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 Tama County

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

Need segment-level traffic data?

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