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Traffic heat map of Adams County, Idaho: 69 miles of roads shaded from blue (light) to red (heavy traffic), busiest on Dartmouth Street and ID 55

Adams County, Idaho Traffic Counts

How busy are the roads of Adams County, Idaho? We measure 69 road miles, divided into 763 segments, with multi-sourced, cross-verified mobile and sensor data. The average road here carries 2,204 vehicles a day, 62% 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 Adams County, Idaho

Traffic

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

vehicles per day2,204
Trucks

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

9.4%
Average travel time

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

40.3 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.

55.7 yrs
Drivers’ average income

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

$65,821

A typical monitored road in Adams County, Idaho sees 2,204 vehicles per day, while its 69 miles of monitored roads together handle 137,788 vehicle-miles traveled per day (≈50.3 million per year). Trucks are 9.4% of traffic, close to the 9.7% across Idaho.

Longer trips than 86% of counties in Idaho

At 2,204 vehicles per day, the average monitored road in Adams carries 62% less traffic than the state average of 5,734, suggesting less demand on each road - very light roads: easy truck access, but little passing trade for roadside retail. In total volume terms, its road network carries about 0.3% of Idaho's statewide total of vehicle-miles. Adams carries less traffic than 65% of counties in Idaho.

Journey times run 19% higher than the state level, at 40.3 minutes on average. 86% of counties in Idaho have a shorter average travel time than Adams's 40.3 minutes.

Congestion runs 57% lower than the state level, at a ratio of 6.8%, which means smoother traffic flow - free-flowing roads make scheduled deliveries highly predictable.

Highway vs. Non-Highway Traffic Analysis

highway traffic icon

Highway Traffic in Adams County, Idaho

Trafficvehicles per day2,934
Trucks9.4%
Average travel time42.4 min
Congestion ratio8.3%
Drivers’ average age55.6 yrs
Drivers’ average income$67,069

Nearly all driving in Adams County, Idaho happens on highways: 95% of every vehicle-mile. The average highway carries 2,934 vehicles per day, 593% more than the average non-highway road in the same area, which carries 424 vehicles per day.

Highways make up 71% of the monitored road miles (49 miles, 541 segments), so they carry more than their share: 131,073 vehicle-miles traveled per day (≈47.8 million per year).

Fewer highway trucks than 91% of counties in Idaho

The concentration of trucks on highways (9.4%) is 33% lower than the state average for similar road classifications. Highways here mostly serve passenger trips, so local access matters more than long-haul routing for logistics operators.

By truck concentration, highways here trail 74% of counties in Idaho. Adams's highway truck count is lower than 91% of counties in Idaho, at roughly 277 trucks per day.

non-highway traffic icon

Non-highway Traffic in Adams County, Idaho

Trafficvehicles per day424
Trucks8.2%
Average travel time35.2 min
Congestion ratio3.2%
Drivers’ average age62.1 yrs
Drivers’ average income$52,847

Local roads play a minor role in Adams County, Idaho, carrying just 5% of all vehicle-miles. The average non-highway road carries 424 vehicles per day.

Local roads make up 29% of the monitored road miles (20 miles in 222 segments) but carry less than their share of travel: 6,715 vehicle-miles traveled per day (≈2.5 million per year). Trucks make up 8.2% of non-highway traffic, about 1 in 12 vehicles.

Older drivers than 93% of counties in Idaho

Compared to highways, non-highway routes see 13% fewer trucks by share.

Non-highway congestion (3.2%) runs 80% lower than the state average, pointing to smoother local traffic flow.

72% of counties in Idaho see higher average driver income among trip origins than Adams. The driver population here skews older than 93% of counties in Idaho.

Time-of-Day & Seasonal Patterns

peak hours icon
Peak Traffic Windows
Weekday peaks:
AM peak 11:00 AM–12:00 PM and a long afternoon plateau from 2:00 PM to 6:00 PM, with volumes reaching approximately 82% higher than the daily average.
Weekend traffic:
Weekends are somewhat quieter: volumes run about 8% below weekday levels, the usual weekend dip.
seasonal traffic icon
Seasonal Fluctuation
Busy season:
June–August is the high season, with volumes +28% versus the annual average.
Lowest month:
December is the quietest month, with volumes -25% versus the annual average - the usual winter low.

Data Finding: Hourly & Seasonal Patterns

In Adams County, Idaho, the peak hour concentrates about 8% of the day's traffic, and there is a strong seasonal swing of +28% in high season.

Adams County vs. Idaho Traffic Comparison

Adams County's biggest difference from the Idaho average is its average daily traffic per road, 62% below it. Its highway truck share is also 33% below.

MetricAdams CountyIdaho averageDifference
Traffic2,2045,734-61.6%
Truck % (Total Traffic)9.4%9.7%-3.0%
Truck % (Highway)9.4%14.1%-33.0%
Avg. Travel Time40.3 min33.8 min+19.2%

How Adams County compares

Adams County against nearby counties

Compared with its 4 closest neighbours, Adams County is 32.6% less congested and sees 22.7% longer typical trips; it has the third busiest roads of the five. Trips here run longer without running slower: distance, not congestion, is what drivers spend their time on.

Adams 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
Adams County2,2049.4%137,78840.3 min6.8%
Washington County, Idaho1,96410.2%194,39938.5 min7.5%
Gem County, Idaho3,2285.8%370,68129.7 min15.7%
Valley County, Idaho3,7807.5%421,43823.3 min9.7%
Wallowa County, Oregon1,6588.0%131,37440.1 min7.4%
Idaho average5,7349.7%N/A33.8 min16.0%

Adams County ranked within Idaho

Average driver age places Adams County #4 of 44 in Idaho - the top quarter of the state.

Adams County ranked among 44 county-level areas in Idaho (1 = highest); measures without data in every county rank a smaller field, down to 35.
MeasureAdams CountyIdaho rank
Traffic volume (AADT)2,204#29 of 44
Highway vehicle-miles per day131,073#30 of 35
Truck share on highways9.4%#26 of 35
Highway trucks per day277#32 of 35
Average travel time40.3 min#7 of 44
Average driver income$65,821#32 of 44
Average driver age55.7 yrs#4 of 44

The two ends of this table sit far apart: #4 of 44 on average driver age, against #32 of 35 on highway truck volume.

Busiest roads in Adams County, Idaho

The three busiest roads in Adams County average 4,150 vehicles a day, 88% more than the county average of 2,204 across all its monitored roads.

Dartmouth Street leads with 4,363 vehicles a day, 283 of them trucks (6.5%). Virginia Street carries the most trucks, 415 a day (10.7% of its traffic), although it ranks #3 for all traffic.

Trips using Little Weiser Road are long: a median of 58.8 minutes against 40.3 county-wide, the mark of a through route.

Drivers on Virginia Street come from neighborhoods with an average household income of $84,900, 29% above the county average of $65,821.

Ranked by daily traffic (AADT)

Cars and light vehiclesTrucks
1Dartmouth StreetTrunk road · 4,363vehicles283trucks · 6.5%
Road class
Trunk road
Congestion ratio
13.1%
Median trip time
47.8 min
Drivers’ median age
58.3 yrs
Drivers’ average income
$50,861

Dartmouth Street carries 2.0 times the county average on its busiest stretch, where the median trip lasts 47.8 minutes.

2ID 55Trunk road · 4,204vehicles385trucks · 9.2%
Road class
Trunk road
Median trip time
31.6 min
Drivers’ median age
54.7 yrs
Drivers’ average income
$77,668

ID 55 carries 91% more than the county average at its busiest, 385 of them trucks (9.2%, in line with the county-wide 9.4%).

3Virginia StreetTrunk road · 3,882vehicles415trucks · 10.7%
Road class
Trunk road
Median trip time
34.6 min
Drivers’ median age
54.1 yrs
Drivers’ average income
$84,900

Virginia Street carries 76% more than the county average on its busiest stretch, where the median trip lasts 34.6 minutes.

4Norris AvenueTrunk road · 3,668vehicles404trucks · 11.0%
Road class
Trunk road
Median trip time
32.2 min
Drivers’ median age
55.8 yrs
Drivers’ average income
$72,605

At 66% more than the county average, Norris Avenue draws drivers from neighborhoods averaging $72,605 in household income.

5US 95Trunk road · 3,388vehicles249trucks · 7.4%
Road class
Trunk road
Congestion ratio
8.4%
Median trip time
50.7 min
Drivers’ median age
58.3 yrs
Drivers’ average income
$55,505

US 95 is busy by local standards, at 54% more than the county average on its busiest stretch; trucks are 7.4% of it, below the county-wide 9.4%.

Ranked by trucks per day

Cars and light vehiclesTrucks
1Virginia StreetTrunk road · #3 by traffic3,882vehicles415trucks · 10.7%
2Norris AvenueTrunk road · #4 by traffic3,668vehicles404trucks · 11.0%
3ID 55Trunk road · #2 by traffic4,204vehicles385trucks · 9.2%
4Dartmouth StreetTrunk road · #1 by traffic4,363vehicles283trucks · 6.5%
5Little Weiser RoadTrunk road · 2,925vehicles250trucks · 8.6%
Road class
Trunk road
Congestion ratio
6.4%
Median trip time
58.8 min
Drivers’ median age
55.8 yrs
Drivers’ average income
$56,274

Little Weiser Road peaks at 2,925 vehicles a day, 33% more than the county average; trucks are 8.6% of it, below the county-wide 9.4%.

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

AdamsDepartment 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 Adams County

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

Need segment-level traffic data?

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