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Traffic heat map of Adams County, Washington: 485 miles of roads shaded from blue (light) to red (heavy traffic), busiest on I 90

Adams County, Washington Traffic Counts

Its highways carry the highest truck share of any county in Washington, 20.1%. This page breaks down traffic in Adams County, Washington across 485 miles of monitored roads split into 1,827 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 icon

Total Traffic Volume & Performance in Adams County, Washington

Traffic

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

vehicles per day2,523
Trucks

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

17.6%
Average travel time

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

40.1 min
Congestion ratio

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

7.6%
Drivers’ average age

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

40.7 yrs
Drivers’ average income

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

$73,529

Our data shows 2,523 vehicles per day on the average road in Adams County, Washington, and 1,620,370 vehicle-miles traveled per day (≈591 million per year) across its 485 miles of monitored roads. About 1 in 6 vehicles is a truck, well above the 7.1% across Washington - a freight-heavy mix.

Longer trips than 89% of counties in Washington

At 2,523 vehicles per day, the average monitored road in Adams carries 66% less traffic than the state average of 7,322, suggesting less demand on each road - very light roads: easy truck access, but little passing trade for roadside retail. Across the whole network, that travel is about 1.0% of Washington's statewide total. By volume, Adams's 2,523 vehicles per day trails 71% of counties in Washington.

At 40.1 minutes, the average travel time is 21% higher than the state level. On travel time, Adams runs longer than 89% of counties in Washington.

At 62% lower than the state level, the 7.6% 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 Adams County, Washington

Trafficvehicles per day5,818
Trucks20.1%
Average travel time78.3 min
Congestion ratio12.5%
Drivers’ average age42.4 yrs
Drivers’ average income$79,902

Highways carry most of the traffic in Adams County, Washington: 73% of all vehicle-miles. The average highway carries 5,818 vehicles per day, 157% more than the average non-highway road in the same area, which carries 2,264 vehicles per day.

With 42% of the road miles (203 miles in 133 segments), highways punch above their length, carrying 1,186,510 vehicle-miles traveled per day (≈433 million per year).

By highway travel volume, Adams outranks 50% of counties in Washington.

The highest highway truck share of any county in Washington

The concentration of trucks on highways (20.1%) is 111% higher than the state average for similar road classifications. That marks Adams as a major freight corridor, where highway access is what logistics operators compete on.

By share, Adams has the highest highway truck concentration in Washington, at 20.1%. By raw truck volume, Adams carries fewer highway trucks than 53% of counties in Washington.

non-highway traffic icon

Non-highway Traffic in Adams County, Washington

Trafficvehicles per day2,264
Trucks10.8%
Average travel time37.1 min
Congestion ratio7.2%
Drivers’ average age40.0 yrs
Drivers’ average income$67,310

Local roads carry a smaller share of travel in Adams County, Washington, 27% of vehicle-miles; most driving happens on highways. The average non-highway road carries 2,264 vehicles per day.

Local roads make up 58% of the monitored road miles (282 miles in 1,694 segments) but carry less than their share of travel: 433,859 vehicle-miles traveled per day (≈158 million per year). Trucks make up 10.8% of non-highway traffic, about 1 in 9 vehicles.

Younger drivers than 97% of counties in Washington

Non-highway roads carry a truck concentration that's 46% lower than the highway network.

The non-highway congestion ratio of 7.2% is 63% lower than the state level, suggesting more efficient local mobility than the state average.

Trip origins here have lower average income than 61% of counties in Washington. 97% of counties in Washington have an older driver population than Adams.

Time-of-Day & Seasonal Patterns

peak hours icon
Peak Traffic Windows
Weekday peaks:
A long morning plateau from 8:00 AM to 12:00 PM and a long afternoon plateau from 2:00 PM to 9:00 PM, with volumes reaching approximately 66% higher than the daily average.
Weekend traffic:
Weekends are somewhat quieter: volumes run about 6% below weekday levels, the usual weekend dip.
seasonal traffic icon
Seasonal Fluctuation
Busy season:
June–August is the high season, with volumes +15% versus the annual average.
Lowest month:
January is the quietest month, with volumes -26% versus the annual average - the usual winter low.

Data Finding: Hourly & Seasonal Patterns

In Adams County, Washington, the peak hour concentrates about 7% of the day's traffic, and there is a strong seasonal swing of +15% in high season.

Adams County vs. Washington Traffic Comparison

The truck share sets Adams County apart: 147% above the Washington average. Its highway truck share is also 111% above.

MetricAdams CountyWashington averageDifference
Traffic2,5237,322-65.5%
Truck % (Total Traffic)17.6%7.1%+147.5%
Truck % (Highway)20.1%9.5%+111.4%
Avg. Travel Time40.1 min33.2 min+21.0%

How Adams County compares

Adams County has a higher truck share than any nearby county

Compared with its 4 closest neighbours, Adams County is 34.5% less congested and runs 6.5 percentage points more truck traffic; it has the fourth busiest roads of the five. Freight passes through here that never reaches the areas around it: the truck share is high precisely because the local car traffic is not.

Adams County and the 4 nearest county-level areas by centroid distance, with the Washington average for scale.
AreaAverage daily trafficTruck shareDaily vehicle-milesAverage travel timeCongestion ratio
Adams County2,52317.6%1,620,37040.1 min7.6%
Lincoln County, Washington1,38114.4%715,27147.6 min7.2%
Whitman County, Washington3,4249.2%837,13735.4 min11.1%
Franklin County, Washington5,2479.5%2,212,41831.7 min17.1%
Grant County, Washington3,49711.5%3,043,38133.8 min11.2%
Washington average7,3227.1%N/A33.2 min19.9%

Adams County ranked within Washington

On truck share on highways, Adams County tops the Washington field outright.

Adams County ranked among 39 county-level areas in Washington (1 = highest); measures without data in every county rank a smaller field, down to 33.
MeasureAdams CountyWashington rank
Traffic volume (AADT)2,523#28 of 39
Highway vehicle-miles per day1,186,510#17 of 33
Truck share on highways20.1%#1 of 33
Highway trucks per day1,169#18 of 33
Average travel time40.1 min#5 of 39
Average driver income$73,529#24 of 39
Average driver age40.7 yrs#38 of 39

The two ends of this table sit far apart: #1 of 33 on truck share on highways, against #38 of 39 on average driver age.

Busiest roads in Adams County, Washington

On their busiest stretches, the three busiest roads in Adams County carry 11,664 vehicles a day on average, 4.6 times the typical road in the county (2,523).

I 90 is the busiest road, at 16,741 vehicles a day, 3,518 of them trucks (21.0%). That is 73% more than the next road, Thomas S. Foley Memorial Highway (9,682). It tops the truck ranking too, with the most trucks.

Trips using Thomas S. Foley Memorial Highway are long: a median of 80.8 minutes against 40.1 county-wide, the mark of a through route.

Main Street is busy with cars rather than freight: only 5.0% of its traffic is trucks, against 17.6% county-wide.

Ranked by daily traffic (AADT)

Cars and light vehiclesTrucks
1I 90Motorway · 16,741vehicles3,518trucks · 21.0%
Road class
Motorway
Congestion ratio
17.5%
Median trip time
75.2 min
Drivers’ median age
41.7 yrs
Drivers’ average income
$78,093

I 90 carries through traffic: the median trip using it lasts 75.2 minutes, against 40.1 for the county.

2Thomas S. Foley Memorial HighwayMotorway · 9,682vehicles2,064trucks · 21.3%
Road class
Motorway
Congestion ratio
7.7%
Median trip time
80.8 min
Drivers’ median age
42.0 yrs
Drivers’ average income
$77,890

At 3.8 times the county average, Thomas S. Foley Memorial Highway draws drivers from neighborhoods averaging $77,890 in household income.

3Main StreetSecondary road · 8,571vehicles424trucks · 5.0%
Road class
Secondary road
Congestion ratio
21.3%
Median trip time
31.9 min
Drivers’ median age
40.2 yrs
Drivers’ average income
$64,874

Travel on Main Street's busiest stretch runs 21% over free-flow time, against 8% across the county, so expect slower peak hours.

4Broadway AvenuePrimary road · 8,294vehicles850trucks · 10.2%
Road class
Primary road
Congestion ratio
18.1%
Median trip time
30.3 min
Drivers’ median age
39.8 yrs
Drivers’ average income
$68,567

Broadway Avenue is one of the more congested roads here: trips take 18% longer than at free-flow speed, against 8% county-wide.

5WA 17Primary road · 7,092vehicles674trucks · 9.5%
Road class
Primary road
Congestion ratio
14.5%
Median trip time
45.8 min
Drivers’ median age
41.1 yrs
Drivers’ average income
$69,743

The busiest stretch of WA 17 carries 2.8 times the county average; trucks are 9.5% of it, below the county-wide 17.6%.

Ranked by trucks per day

Cars and light vehiclesTrucks
1I 90Motorway · #1 by traffic16,741vehicles3,518trucks · 21.0%
2Thomas S. Foley Memorial HighwayMotorway · #2 by traffic9,682vehicles2,064trucks · 21.3%
3Broadway AvenuePrimary road · #4 by traffic8,294vehicles850trucks · 10.2%
4WA 17Primary road · #5 by traffic7,092vehicles674trucks · 9.5%
5Radar RoadPrimary road · 5,896vehicles640trucks · 10.8%
Road class
Primary road
Congestion ratio
12.9%
Median trip time
34.6 min
Drivers’ median age
40.3 yrs
Drivers’ average income
$73,102

On its busiest stretch, Radar Road carries 2.3 times the county average; trucks are 10.8% of it, below the county-wide 17.6%.

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, Washington.

Need segment-level traffic data?

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