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Traffic heat map of Union County, Oregon: 364 miles of roads shaded from blue (light) to red (heavy traffic), busiest on Island Avenue

Union County, Oregon Traffic Counts

Our Union County, Oregon traffic data covers 2,354 road segments over 364 road miles, with an average segment of just 817 ft. Its highways carry the highest truck share of any county in Oregon, 27.6%. Whether you are evaluating a new retail location, planning routes or assessing infrastructure, these numbers replace guesswork.
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 Union County, Oregon

Traffic

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

vehicles per day2,375
Trucks

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

20.0%
Average travel time

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

41.0 min
Congestion ratio

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

7.9%
Drivers’ average age

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

47.3 yrs
Drivers’ average income

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

$67,271

Our data shows 2,375 vehicles per day on the average road in Union County, Oregon, and 916,121 vehicle-miles traveled per day (≈334 million per year) across its 364 miles of monitored roads. Freight weighs heavily here: trucks are 20.0% of traffic, against 9.2% across Oregon.

Longer trips than 89% of counties in Oregon

At 2,375 vehicles per day, the average monitored road in Union carries 60% less traffic than the state average of 5,908, suggesting less demand on each road - very light roads: easy truck access, but little passing trade for roadside retail. Network-wide, Union accounts for about 1.1% of Oregon's statewide total of vehicle-miles. 77% of counties in Oregon see more traffic than Union's 2,375 vehicles per day.

The average trip takes 41.0 minutes, 20% higher than the state level. Its average travel time of 41.0 minutes is longer than 89% of counties in Oregon.

The congestion ratio of 7.9% is 52% lower, pointing to smoother traffic flow than the state level - free-flowing roads make scheduled deliveries highly predictable.

Highway vs. Non-Highway Traffic Analysis

highway traffic icon

Highway Traffic in Union County, Oregon

Trafficvehicles per day5,853
Trucks27.6%
Average travel time53.3 min
Congestion ratio12.6%
Drivers’ average age48.6 yrs
Drivers’ average income$72,451

Highways carry more than half of all travel in Union County, Oregon (63% of vehicle-miles). The average highway carries 5,853 vehicles per day, 174% more than the average non-highway road in the same area, which carries 2,138 vehicles per day.

Highways make up 26% of the monitored road miles (93 miles, 150 segments), so they carry more than their share: 572,908 vehicle-miles traveled per day (≈209 million per year).

The highest highway truck share of any county in Oregon

The concentration of trucks on highways (27.6%) is 130% higher than the state average for similar road classifications. That marks Union as a major freight corridor, where highway access is what logistics operators compete on.

At 27.6%, Union's highway truck concentration is the highest in Oregon. Union's highway truck count is higher than 78% of counties in Oregon, at roughly 1,614 trucks per day.

non-highway traffic icon

Non-highway Traffic in Union County, Oregon

Trafficvehicles per day2,138
Trucks7.4%
Average travel time40.2 min
Congestion ratio7.6%
Drivers’ average age46.8 yrs
Drivers’ average income$65,613

Local roads carry a significant share of travel in Union County, Oregon: 37% of all vehicle-miles. On the average non-highway road, that comes to 2,138 vehicles per day.

Spread over 271 miles and 2,204 segments, 74% of the road network, local roads carry a lighter load per mile: 343,212 vehicle-miles traveled per day (≈125 million per year). The truck share on non-highway roads is 7.4%.

Local congestion 53% below the Oregon average

Compared to highways, non-highway routes see 73% fewer trucks by share.

At 53% lower than the state level, the non-highway congestion ratio of 7.6% signals easier movement on local roads.

69% of counties in Oregon see higher average driver income among trip origins than Union. Union's median driver age is lower than 63% of counties in Oregon.

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 1:00 PM to 8:00 PM, with volumes reaching approximately 66% higher than the daily average.
Weekend traffic:
Weekends are somewhat quieter: volumes run about 12% below weekday levels, the usual weekend dip.
seasonal traffic icon
Seasonal Fluctuation
Busy season:
June–August is the high season, with volumes +21% 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 Union County, Oregon, the peak hour concentrates about 7% of the day's traffic, and there is a strong seasonal swing of +21% in high season.

Union County vs. Oregon Traffic Comparison

Union County's biggest difference from the Oregon average is its highway truck share, 130% above it. Its truck share is also 117% above.

MetricUnion CountyOregon averageDifference
Traffic2,3755,908-59.8%
Truck % (Total Traffic)20.0%9.2%+117.3%
Truck % (Highway)27.6%12.0%+129.9%
Avg. Travel Time41.0 min34.3 min+19.7%

How Union County compares

Union County against nearby counties

Against the 4 nearest areas, Union County runs 6.0 percentage points more truck traffic; it has the second busiest roads of the five. Traffic volume here matches the areas around it, but more of that traffic is trucks - a difference in what routes through, not in how much.

Union County and the 4 nearest county-level areas by centroid distance, with the Oregon average for scale.
AreaAverage daily trafficTruck shareDaily vehicle-milesAverage travel timeCongestion ratio
Union County2,37520.0%916,12141.0 min7.9%
Umatilla County, Oregon3,28615.6%2,380,85931.7 min10.4%
Wallowa County, Oregon1,6588.0%131,37440.1 min7.4%
Baker County, Oregon2,13521.4%1,127,54941.8 min6.9%
Columbia County, Washington2,03511.1%78,69744.4 min7.2%
Oregon average5,9089.2%N/A34.3 min16.6%

Union County ranked within Oregon

Union County posts the highest truck share on highways of any county-level area in Oregon.

Union County ranked among 36 county-level areas in Oregon (1 = highest); measures without data in every county rank a smaller field, down to 33.
MeasureUnion CountyOregon rank
Traffic volume (AADT)2,375#28 of 36
Highway vehicle-miles per day572,908#25 of 33
Truck share on highways27.6%#1 of 33
Highway trucks per day1,614#8 of 33
Average travel time41.0 min#5 of 36
Average driver income$67,271#25 of 36
Average driver age47.3 yrs#23 of 36

The two ends of this table sit far apart: #1 of 33 on truck share on highways, against #28 of 36 on average daily traffic volume.

Busiest roads in Union County, Oregon

The three busiest roads in Union County average 11,824 vehicles a day, 5.0 times the county average of 2,375 across all its monitored roads.

Island Avenue leads with 13,420 vehicles a day, 791 of them trucks (5.9%). Old Oregon Trail Highway carries the most trucks, 3,337 a day (27.7% of its traffic), although it ranks #2 for all traffic.

Few trucks use Island Avenue: 5.9% of its traffic, under half the county's 20.0%.

Old Oregon Trail Highway carries longer journeys than most roads here, with a median trip of 53.6 minutes against 41.0 county-wide.

Ranked by daily traffic (AADT)

Cars and light vehiclesTrucks
1Island AvenuePrimary road · 13,420vehicles791trucks · 5.9%
Road class
Primary road
Congestion ratio
16.9%
Median trip time
35.8 min
Drivers’ median age
47.5 yrs
Drivers’ average income
$62,329

Island Avenue is one of the more congested roads here: trips take 17% longer than at free-flow speed, against 8% county-wide.

2Old Oregon Trail HighwayMotorway · 12,045vehicles3,337trucks · 27.7%
Road class
Motorway
Congestion ratio
12.6%
Median trip time
53.6 min
Drivers’ median age
48.6 yrs
Drivers’ average income
$72,451

Old Oregon Trail Highway is a trunk route for the county, carrying 5.1 times the county average on its busiest stretch; trucks are 27.7% of it, above the county-wide 20.0%.

31st StreetPrimary road · 10,006vehicles663trucks · 6.6%
Road class
Primary road
Congestion ratio
13.9%
Median trip time
41.4 min
Drivers’ median age
47.8 yrs
Drivers’ average income
$65,990

1st Street carries 4.2 times the county average at its busiest, 663 of them trucks (6.6%, below the county-wide 20.0%).

4McAlister RoadPrimary road · 7,626vehicles600trucks · 7.9%
Road class
Primary road
Congestion ratio
17.9%
Median trip time
31.7 min
Drivers’ median age
47.8 yrs
Drivers’ average income
$72,767

Delays build on McAlister Road: its congestion ratio of 18% over free-flow time is well above the county's 8%.

5Fir StreetSecondary road · 5,779vehicles298trucks · 5.2%
Road class
Secondary road
Congestion ratio
12.9%
Median trip time
53.4 min
Drivers’ median age
44.8 yrs
Drivers’ average income
$53,576

Drivers on Fir Street are on long journeys, a median 53.4 minutes against 41.0 county-wide: a through route more than a local street.

Ranked by trucks per day

Cars and light vehiclesTrucks
1Old Oregon Trail HighwayMotorway · #2 by traffic12,045vehicles3,337trucks · 27.7%
2Island AvenuePrimary road · #1 by traffic13,420vehicles791trucks · 5.9%
31st StreetPrimary road · #3 by traffic10,006vehicles663trucks · 6.6%
4McAlister RoadPrimary road · #4 by traffic7,626vehicles600trucks · 7.9%
5Wallowa Lake HighwayPrimary road · 4,567vehicles381trucks · 8.3%
Road class
Primary road
Congestion ratio
11.1%
Median trip time
32.4 min
Drivers’ median age
50.0 yrs
Drivers’ average income
$68,596

Wallowa Lake Highway peaks at 4,567 vehicles a day, 92% more than the county average; trucks are 8.3% of it, below the county-wide 20.0%.

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

UnionDepartment 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 Union County

The same traffic breakdown for the areas closest to Union County, Oregon.

Need segment-level traffic data?

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