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Traffic heat map of Lewis County, Idaho: 69 miles of roads shaded from blue (light) to red (heavy traffic), busiest on 3rd Street and Pine Street

Lewis County, Idaho Traffic Counts

How busy are the roads of Lewis County, Idaho? We measure 69 road miles, divided into 424 segments, with multi-sourced, cross-verified mobile and sensor data. The average road here carries 1,916 vehicles a day, 67% less than the Idaho average of 5,734. 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 Lewis County, Idaho

Traffic

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

vehicles per day1,916
Trucks

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

10.2%
Average travel time

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

27.0 min
Drivers’ average age

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

57.6 yrs
Drivers’ average income

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

$56,872

The average monitored road in Lewis County, Idaho carries 1,916 vehicles per day. Across its 69 miles of monitored roads, that adds up to 116,101 vehicle-miles traveled per day (≈42.4 million per year). Trucks are 10.2% of traffic, close to the 9.7% across Idaho.

Shorter trips than 95% of counties in Idaho

Lewis's average daily traffic volume is 67% lower than the state average - 1,916 vehicles per day against 5,734 - suggesting less traffic load per road - quiet roads that suit freight movement more than drive-by retail. Network-wide, Lewis accounts for about 0.3% of Idaho's statewide total of vehicle-miles. 86% of counties in Idaho see more traffic than Lewis's 1,916 vehicles per day.

Journey times run 20% lower than the state level, at 27.0 minutes on average. On travel time, Lewis runs shorter than 95% of counties in Idaho.

Highway vs. Non-Highway Traffic Analysis

highway traffic icon

Highway Traffic in Lewis County, Idaho

Trafficvehicles per day4,178
Trucks10.7%
Average travel time29.8 min
Drivers’ average age57.7 yrs
Drivers’ average income$57,824

Highways carry the vast majority of travel in Lewis County, Idaho, 87% of all vehicle-miles. The average highway carries 4,178 vehicles per day, 455% more than the average non-highway road in the same area, which carries 753 vehicles per day.

Highways make up 54% of the monitored road miles (37 miles, 144 segments), so they carry more than their share: 100,695 vehicle-miles traveled per day (≈36.8 million per year).

Fewer highway trucks than 85% of counties in Idaho

At 10.7%, highway truck share is 24% lower than the state average. Highways here mostly serve passenger trips, so local access matters more than long-haul routing for logistics operators.

Lewis's highway truck share (10.7%) is higher than 50% of counties in Idaho. 85% of counties in Idaho see more highway trucks per day than Lewis's roughly 447.

non-highway traffic icon

Non-highway Traffic in Lewis County, Idaho

Trafficvehicles per day753
Trucks7.2%
Average travel time25.6 min
Drivers’ average age57.0 yrs
Drivers’ average income$54,702

Only a small share of travel in Lewis County, Idaho happens on local roads: 13% of vehicle-miles. The average non-highway road carries 753 vehicles per day.

Local roads make up 46% of the monitored road miles (32 miles in 280 segments) but carry less than their share of travel: 15,406 vehicle-miles traveled per day (≈5.6 million per year). Trucks make up 7.2% of non-highway traffic, about 1 in 14 vehicles.

Older drivers than 98% of counties in Idaho

Non-highway roads carry a truck concentration that's 32% lower than the highway network.

Lewis's average driver income is lower than 88% of counties in Idaho. 98% of counties in Idaho have a younger driver population than Lewis.

Time-of-Day & Seasonal Patterns

peak hours icon
Peak Traffic Windows
Weekday peaks:
A long morning plateau from 7:00 AM to 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 somewhat quieter: volumes run about 14% below weekday levels, the usual weekend dip.
seasonal traffic icon
Seasonal Fluctuation
Busy season:
June–August is the high season, with volumes +18% versus the annual average.
Lowest month:
January is the quietest month, with volumes -21% versus the annual average - the usual winter low.

Data Finding: Hourly & Seasonal Patterns

In Lewis County, Idaho, the peak hour concentrates about 8% of the day's traffic, and there is a strong seasonal swing of +18% in high season.

Lewis County vs. Idaho Traffic Comparison

Of the four measures, average daily traffic per road differs most: Lewis County runs 67% below the Idaho average. Its highway truck share is also 24% below.

MetricLewis CountyIdaho averageDifference
Traffic1,9165,734-66.6%
Truck % (Total Traffic)10.2%9.7%+5.9%
Truck % (Highway)10.7%14.1%-24.1%
Avg. Travel Time27.0 min33.8 min-20.1%

How Lewis County compares

Lewis County has the quietest roads among its nearby counties

Compared with its 4 closest neighbours, Lewis County carries 56.9% less traffic on a typical road and moves 25.7% of the total daily travel; it has the quietest roads of the five. Smaller and quieter on both counts: a shorter network than the areas around it, carrying lighter traffic across it.

Lewis County and the 4 nearest county-level areas by centroid distance, with the Idaho average for scale.
AreaAverage daily trafficTruck shareDaily vehicle-milesAverage travel timeCongestion ratio
Lewis County1,91610.2%116,10127.0 minN/A
Nez Perce County, Idaho8,0986.4%1,053,61432.9 minN/A
Clearwater County, Idaho2,54910.1%139,07726.2 minN/A
Asotin County, Washington3,3065.7%200,35628.8 min12.3%
Latah County, Idaho3,8417.5%416,48830.0 min17.3%
Idaho average5,7349.7%N/A33.8 min16.0%

Lewis County ranked within Idaho

Lewis County sits in Idaho's top three on average driver age.

Lewis County ranked among 44 county-level areas in Idaho (1 = highest); measures without data in every county rank a smaller field, down to 35.
MeasureLewis CountyIdaho rank
Traffic volume (AADT)1,916#38 of 44
Highway vehicle-miles per day100,695#31 of 35
Truck share on highways10.7%#18 of 35
Highway trucks per day447#30 of 35
Average travel time27.0 min#42 of 44
Average driver income$56,872#39 of 44
Average driver age57.6 yrs#2 of 44

The two ends of this table sit far apart: #2 of 44 on average driver age, against #42 of 44 on average travel time.

Busiest roads in Lewis County, Idaho

On their busiest stretches, the three busiest roads in Lewis County carry 4,143 vehicles a day on average, 2.2 times the typical road in the county (1,916).

3rd Street is the busiest road, at 5,290 vehicles a day, 476 of them trucks (9.0%). It tops the truck ranking too, with the most trucks.

Trips using US 95 are long: a median of 48.3 minutes against 27.0 county-wide, the mark of a through route.

Ranked by daily traffic (AADT)

Cars and light vehiclesTrucks
13rd StreetTrunk road · 5,290vehicles476trucks · 9.0%
Road class
Trunk road
Median trip time
25.1 min
Drivers’ median age
59.2 yrs
Drivers’ average income
$47,803

3rd Street carries 2.8 times the county average on its busiest stretch, where the median trip lasts 25.1 minutes.

2Pine StreetSecondary road · 3,587vehicles218trucks · 6.1%
Road class
Secondary road
Median trip time
26.3 min
Drivers’ median age
56.8 yrs
Drivers’ average income
$45,302

Pine Street peaks at 3,587 vehicles a day, 87% more than the county average; trucks are 6.1% of it, below the county-wide 10.2%.

3US 95Trunk road · 3,553vehicles363trucks · 10.2%
Road class
Trunk road
Median trip time
48.3 min
Drivers’ median age
50.7 yrs
Drivers’ average income
$66,212

US 95 carries 85% more than the county average at its busiest, 363 of them trucks (10.2%, in line with the county-wide 10.2%).

45th StreetSecondary road · 2,206vehicles139trucks · 6.3%
Road class
Secondary road
Median trip time
24.9 min
Drivers’ median age
57.5 yrs
Drivers’ average income
$44,225

5th Street carries 15% more than the county average on its busiest stretch, where the median trip lasts 24.9 minutes.

5US 12Trunk road · 1,353vehicles175trucks · 12.9%
Road class
Trunk road
Median trip time
36.4 min
Drivers’ median age
57.8 yrs
Drivers’ average income
$44,829

Drivers on US 12 are on long journeys, a median 36.4 minutes against 27.0 county-wide: a through route more than a local street.

Ranked by trucks per day

Cars and light vehiclesTrucks
13rd StreetTrunk road · #1 by traffic5,290vehicles476trucks · 9.0%
2US 95Trunk road · #3 by traffic3,553vehicles363trucks · 10.2%
3Pine StreetSecondary road · #2 by traffic3,587vehicles218trucks · 6.1%
4US 12Trunk road · #5 by traffic1,353vehicles175trucks · 12.9%
55th StreetSecondary road · #4 by traffic2,206vehicles139trucks · 6.3%
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

LewisDepartment 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 Lewis County

The same traffic breakdown for the areas closest to Lewis County, Idaho.

Need segment-level traffic data?

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