
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 |
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Trucks The percentage of the total traffic volume composed of heavy vehicles. | 22.5% |
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Average travel time The average time of travel averaged among all vehicles traveling on the road network. | 57.5 min |
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Congestion ratio The rate at which the actual travel time exceeds free-flow travel time, averaged among all roads in the network. | 4.8% |
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Drivers’ average age Average age of residents in the geographic areas where the vehicle trips originated. | 46.3 yrs |
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Drivers’ average income Average income of residents in the geographic areas where the vehicle trips originated. | $70,858 |
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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 in Gilliam County, Oregon
| Traffic | vehicles per day6,329 |
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| Trucks | 23.0% |
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| Average travel time | 62.6 min |
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| Congestion ratio | 15.2% |
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| Drivers’ average age | 45.8 yrs |
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| Drivers’ average income | $71,084 |
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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 in Gilliam County, Oregon
| Traffic | vehicles per day808 |
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| Trucks | 14.0% |
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| Average travel time | 56.8 min |
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| Congestion ratio | 3.5% |
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| Drivers’ average age | 59.7 yrs |
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| Drivers’ average income | $65,549 |
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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.