
Total Traffic Volume & Performance in Clinton County, Iowa
Traffic The average number of vehicles that travel each day over any road in the road network. | vehicles per day2,761 |
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Trucks The percentage of the total traffic volume composed of heavy vehicles. | 8.4% |
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Average travel time The average time of travel averaged among all vehicles traveling on the road network. | 32.8 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. | 9.3% |
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Drivers’ average age Average age of residents in the geographic areas where the vehicle trips originated. | 50.9 yrs |
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Drivers’ average income Average income of residents in the geographic areas where the vehicle trips originated. | $74,703 |
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Our data shows 2,761 vehicles per day on the average road in Clinton County, Iowa, and 1,047,400 vehicle-miles traveled per day (≈382 million per year) across its 454 miles of monitored roads. About 1 in 12 vehicles is a truck, fewer than the 1 in 9 across Iowa.
Busier roads than 85% of counties in Iowa
At 2,761 vehicles per day, the average road in Clinton carries somewhat less traffic than the state average of 3,042 (9% less). In total volume terms, its road network carries about 1.3% of Iowa's statewide total of vehicle-miles. 85% of counties in Iowa see less traffic than Clinton's 2,761 vehicles per day.
Journey times here (32.8 minutes on average) closely track the state level. On travel time, Clinton runs shorter than 60% of counties in Iowa.
Congestion runs 18% lower than the state level, at a ratio of 9.3%, which means smoother traffic flow - relevant for traffic control and delivery planning.
Highway vs. Non-Highway Traffic Analysis

Highway Traffic in Clinton County, Iowa
| Traffic | vehicles per day6,375 |
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| Trucks | 10.6% |
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| Average travel time | 39.4 min |
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| Congestion ratio | 13.5% |
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| Drivers’ average age | 50.5 yrs |
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| Drivers’ average income | $76,836 |
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Travel in Clinton County, Iowa splits roughly evenly, with about half of it (53% of vehicle-miles) on highways. The average highway carries 6,375 vehicles per day, 171% more than the average non-highway road in the same area, which carries 2,351 vehicles per day.
With 22% of the road miles (100 miles in 366 segments), highways punch above their length, carrying 552,444 vehicle-miles traveled per day (≈202 million per year).
By highway travel volume, Clinton outranks 77% of counties in Iowa.
Lower highway truck share than 94% of counties in Iowa
The concentration of trucks on highways (10.6%) is 34% 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 94% of counties in Iowa. Clinton's highway truck count is lower than 64% of counties in Iowa, at roughly 676 trucks per day.

Non-highway Traffic in Clinton County, Iowa
| Traffic | vehicles per day2,351 |
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| Trucks | 5.9% |
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| Average travel time | 32.1 min |
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| Congestion ratio | 8.9% |
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| Drivers’ average age | 51.3 yrs |
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| Drivers’ average income | $73,443 |
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Travel in Clinton County, Iowa splits roughly evenly, with about half of it (47% of vehicle-miles) on local roads. On the average non-highway road, that comes to 2,351 vehicles per day.
Local roads make up 78% of the monitored road miles (354 miles in 3,223 segments) but carry less than their share of travel: 494,955 vehicle-miles traveled per day (≈181 million per year). About 1 in 17 vehicles on non-highway roads is a truck (5.9%).
Local roads carry 45% fewer trucks by share than highways
The concentration of trucks on non-highway roads is 45% lower than on highways.
Non-highway congestion (8.9%) runs 20% lower than the state average, pointing to smoother local traffic flow.
Trip origins here have higher average income than 59% of counties in Iowa. 61% of counties in Iowa have a younger driver population than Clinton.