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Traffic heat map of Gilliam County, Oregon: 108 miles of roads shaded from blue (light) to red (heavy traffic), busiest on Columbia River Highway

Gilliam County, Oregon Traffic Counts

How busy are the roads of Gilliam County, Oregon? We measure 108 road miles, divided into 274 segments, with multi-sourced, cross-verified mobile and sensor data. Trips here are the longest of any county in Oregon, a median 57.5 minutes. 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 Volume & Performance in Gilliam County, Oregon

Traffic

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

vehicles per day1,432
Trucks

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

22.5%
Average travel time

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

57.5 min
Congestion ratio

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

4.8%
Drivers’ average age

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

46.3 yrs
Drivers’ average income

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

$70,858

Our data shows 1,432 vehicles per day on the average road in Gilliam County, Oregon, and 432,774 vehicle-miles traveled per day (≈158 million per year) across its 108 miles of monitored roads. Freight weighs heavily here: trucks are 22.5% of traffic, against 9.2% across Oregon.

The longest trips of any county in Oregon

Gilliam's average daily traffic volume is 76% lower than the state average - 1,432 vehicles per day against 5,908 - suggesting less traffic load per road - very light roads: easy truck access, but little passing trade for roadside retail. In total volume terms, its road network carries about 0.5% of Oregon's statewide total of vehicle-miles. 94% of counties in Oregon see more traffic than Gilliam's 1,432 vehicles per day.

The average trip takes 57.5 minutes, 68% higher than the state level. Gilliam additionally records the highest average travel time of any county in Oregon - 57.5 minutes.

At 71% lower than the state level, the 4.8% congestion ratio signals smoother traffic flow - delays are rare enough to plan travel times almost to the minute.

Highway vs. Non-Highway Traffic Analysis

highway traffic icon

Highway Traffic in Gilliam County, Oregon

Trafficvehicles per day6,329
Trucks23.0%
Average travel time62.6 min
Congestion ratio15.2%
Drivers’ average age45.8 yrs
Drivers’ average income$71,084

Nearly all driving in Gilliam County, Oregon happens on highways: 94% of every vehicle-mile. The average highway carries 6,329 vehicles per day, 684% more than the average non-highway road in the same area, which carries 808 vehicles per day.

Highways make up 52% of the monitored road miles (56 miles, 31 segments), so they carry more than their share: 406,039 vehicle-miles traveled per day (≈148 million per year).

A major freight corridor

Highway truck concentration here runs 92% higher than the state average, at 23.0%. That marks Gilliam as a major freight corridor, where highway access is what logistics operators compete on.

Gilliam's highway truck share (23.0%) is higher than 94% of counties in Oregon. By raw truck volume, Gilliam carries more highway trucks than 75% of counties in Oregon.

non-highway traffic icon

Non-highway Traffic in Gilliam County, Oregon

Trafficvehicles per day808
Trucks14.0%
Average travel time56.8 min
Congestion ratio3.5%
Drivers’ average age59.7 yrs
Drivers’ average income$65,549

Only a small share of travel in Gilliam County, Oregon happens on local roads: 6% of vehicle-miles. The average non-highway road carries 808 vehicles per day.

Local roads make up 48% of the monitored road miles (52 miles in 243 segments) but carry less than their share of travel: 26,735 vehicle-miles traveled per day (≈9.8 million per year). About 1 in 7 vehicles on non-highway roads is a truck (14.0%).

Local congestion 79% below the Oregon average

Compared to highways, non-highway routes see 39% fewer trucks by share.

At 79% lower than the state level, the non-highway congestion ratio of 3.5% signals easier movement on local roads.

54% of counties in Oregon see lower average driver income among trip origins than Gilliam. 70% of counties in Oregon have an older driver population than Gilliam.

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 PM peak 2:00 PM–3:00 PM, with volumes reaching approximately 77% higher than the daily average.
Weekend traffic:
Weekends are much quieter: volumes run about 31% below weekday levels, the signature of a commute-driven road network.
seasonal traffic icon
Seasonal Fluctuation
Busy season:
June–August is the high season, with volumes +22% 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 Gilliam County, Oregon, the peak hour concentrates about 7% of the day's traffic, and there is a strong seasonal swing of +22% in high season.

Gilliam County vs. Oregon Traffic Comparison

Of the four measures, truck share differs most: Gilliam County runs 144% above the Oregon average. Its highway truck share is also 92% above.

MetricGilliam CountyOregon averageDifference
Traffic1,4325,908-75.8%
Truck % (Total Traffic)22.5%9.2%+144.0%
Truck % (Highway)23.0%12.0%+92.1%
Avg. Travel Time57.5 min34.3 min+67.6%

How Gilliam County compares

Gilliam County moves the least traffic of its nearby counties

Against the 4 nearest areas, Gilliam County is 43.1% less congested and sees 46.0% longer typical trips; it has the quietest 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.

Gilliam 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
Gilliam County1,43222.5%432,77457.5 min4.8%
Sherman County, Oregon2,19919.7%631,26053.2 min8.3%
Morrow County, Oregon1,99716.2%735,70934.8 min5.8%
Klickitat County, Washington2,35912.1%723,93631.4 min8.4%
Wasco County, Oregon3,11315.9%1,390,08938.1 min11.2%
Oregon average5,9089.2%N/A34.3 min16.6%

Gilliam County ranked within Oregon

No other county-level area in Oregon records a higher average travel time than Gilliam County.

Gilliam County ranked among 36 county-level areas in Oregon (1 = highest); measures without data in every county rank a smaller field, down to 33.
MeasureGilliam CountyOregon rank
Traffic volume (AADT)1,432#34 of 36
Highway vehicle-miles per day406,039#29 of 33
Truck share on highways23.0%#3 of 33
Highway trucks per day1,458#9 of 33
Average travel time57.5 min#1 of 36
Average driver income$70,858#17 of 36
Average driver age46.3 yrs#25 of 36

Gilliam County ranks #3 of 33 on truck share on highways but #34 of 36 on average daily traffic volume. It is a freight corridor without the traffic to match: trucks dominate the mix precisely because there is so little local car traffic to dilute them.

Busiest roads in Gilliam County, Oregon

The three busiest roads in Gilliam County average 5,650 vehicles a day, 3.9 times the county average of 1,432 across all its monitored roads.

Columbia River Highway is the busiest road, at 14,465 vehicles a day, 3,331 of them trucks (23.0%). That is 11.6 times the next road, Main Street (1,244). It tops the truck ranking too, with the most trucks.

Trucks make up 98.9% of traffic on Blalock Canyon Road, against 22.5% across all roads in the county.

Main Street skews older: its drivers' median age is 64.0, compared with 46.3 county-wide.

Trips on Main Street are short, a median of 24.6 minutes against 57.5 county-wide, so it serves mostly local traffic.

Ranked by daily traffic (AADT)

Cars and light vehiclesTrucks
1Columbia River HighwayMotorway · 14,465vehicles3,331trucks · 23.0%
Road class
Motorway
Congestion ratio
15.2%
Median trip time
62.6 min
Drivers’ median age
45.8 yrs
Drivers’ average income
$71,084

Travel on Columbia River Highway's busiest stretch runs 15% over free-flow time, against 5% across the county, so expect slower peak hours.

2Main StreetSecondary road · 1,244vehicles77trucks · 6.2%
Road class
Secondary road
Congestion ratio
3.9%
Median trip time
24.6 min
Drivers’ median age
64.0 yrs
Drivers’ average income
$55,385

Main Street is a quieter road: its busiest stretch carries 13% less than the county average; trucks are 6.2% of it, below the county-wide 22.5%.

3Locust StreetSecondary road · 1,242vehicles126trucks · 10.1%
Road class
Secondary road
Congestion ratio
3.0%
Median trip time
64.9 min
Drivers’ median age
50.5 yrs
Drivers’ average income
$74,609

Even at its busiest, Locust Street carries 13% less than the county average; trucks are 10.1% of it, below the county-wide 22.5%.

4John Day HighwaySecondary road · 645vehicles87trucks · 13.5%
Road class
Secondary road
Congestion ratio
2.8%
Median trip time
53.1 min
Drivers’ median age
52.5 yrs
Drivers’ average income
$72,755

John Day Highway is a quieter road: its busiest stretch carries 55% less than the county average; trucks are 13.5% of it, below the county-wide 22.5%.

5Walnut StreetSecondary road · 565vehicles44trucks · 7.8%
Road class
Secondary road
Median trip time
29.7 min
Drivers’ median age
64.0 yrs
Drivers’ average income
$55,385

Walnut Street is a local road at heart: the median trip using it lasts 29.7 minutes, against 57.5 for the county.

Ranked by trucks per day

Cars and light vehiclesTrucks
1Columbia River HighwayMotorway · #1 by traffic14,465vehicles3,331trucks · 23.0%
2Blalock Canyon RoadTertiary road · 176vehicles174trucks · 98.9%
Road class
Tertiary road

Even at its busiest, Blalock Canyon Road carries 88% less than the county average; trucks are 98.9% of it, above the county-wide 22.5%.

3Locust StreetSecondary road · #3 by traffic1,242vehicles126trucks · 10.1%
4John Day HighwaySecondary road · #4 by traffic645vehicles87trucks · 13.5%
5Main StreetSecondary road · #2 by traffic1,244vehicles77trucks · 6.2%
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

GilliamDepartment 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 Gilliam County

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

Need segment-level traffic data?

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