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Traffic heat map of Colusa County, California: 311 miles of roads shaded from blue (light) to red (heavy traffic), busiest on Side Highway and Bridge Street

Colusa County, California Traffic Counts

Its highways carry one of the top 3 truck shares of any county in California. This page breaks down traffic in Colusa County, California across 311 miles of monitored roads split into 2,379 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 Volume & Performance in Colusa County, California

Traffic

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

vehicles per day3,191
Trucks

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

21.1%
Average travel time

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

39.5 min
Congestion ratio

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

10.1%
Drivers’ average age

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

45.0 yrs
Drivers’ average income

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

$79,838

A typical monitored road in Colusa County, California sees 3,191 vehicles per day, while its 311 miles of monitored roads together handle 1,487,588 vehicle-miles traveled per day (≈543 million per year). About 1 in 5 vehicles is a truck, well above the 7.8% across California - a freight-heavy mix.

Longer trips than 89% of counties in California

Colusa's average daily traffic volume is 75% lower than the state average - 3,191 vehicles per day against 12,766 - suggesting less traffic load per road - quiet roads that suit freight movement more than drive-by retail. Across the whole network, that travel is about 0.2% of California's statewide total. 84% of counties in California see more traffic than Colusa's 3,191 vehicles per day.

Journey times run 15% higher than the state level, at 39.5 minutes on average. 89% of counties in California have a shorter average travel time than Colusa's 39.5 minutes.

The congestion ratio of 10.1% is 63% 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 Colusa County, California

Trafficvehicles per day9,665
Trucks23.4%
Average travel time58.2 min
Congestion ratio24.5%
Drivers’ average age45.2 yrs
Drivers’ average income$81,018

The vast majority of driving in Colusa County, California happens on highways: 84% of all vehicle-miles. The average highway carries 9,665 vehicles per day, 558% more than the average non-highway road in the same area, which carries 1,469 vehicles per day.

With 35% of the road miles (111 miles in 500 segments), highways punch above their length, carrying 1,256,518 vehicle-miles traveled per day (≈459 million per year).

A major freight corridor

Highway truck concentration here runs 126% higher than the state average, at 23.4%. That marks Colusa as a major freight corridor, where highway access is what logistics operators compete on.

96% of counties in California see a lower highway truck share than Colusa's 23.4%. 55% of counties in California see more highway trucks per day than Colusa's roughly 2,263.

non-highway traffic icon

Non-highway Traffic in Colusa County, California

Trafficvehicles per day1,469
Trucks8.5%
Average travel time34.5 min
Congestion ratio6.3%
Drivers’ average age43.9 yrs
Drivers’ average income$76,655

At 16% of vehicle-miles, local roads carry a smaller share of the traffic in Colusa County, California than highways. The average non-highway road carries 1,469 vehicles per day.

Spread over 201 miles and 1,879 segments, 65% of the road network, local roads carry a lighter load per mile: 231,069 vehicle-miles traveled per day (≈84.3 million per year). Trucks make up 8.5% of non-highway traffic, about 1 in 12 vehicles.

Local congestion 76% below the California average

Non-highway roads carry a truck concentration that's 64% lower than the highway network.

At 76% lower than the state level, the non-highway congestion ratio of 6.3% signals easier movement on local roads.

Trip origins here have lower average income than 67% of counties in California. Colusa's median driver age is higher than 51% of counties in California.

Time-of-Day & Seasonal Patterns

Data Finding: Hourly & Seasonal Patterns

In Colusa County, California, the peak hour concentrates about 7% of the day's traffic.

Colusa County vs. California Traffic Comparison

The truck share sets Colusa County apart: 171% above the California average. Its highway truck share is also 126% above.

MetricColusa CountyCalifornia averageDifference
Traffic3,19112,766-75.0%
Truck % (Total Traffic)21.1%7.8%+171.4%
Truck % (Highway)23.4%10.4%+125.5%
Avg. Travel Time39.5 min34.5 min+14.6%

How Colusa County compares

Colusa County is the least congested of its nearby counties

Against the 4 nearest areas, Colusa County is 36.7% less congested and runs 9.3 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.

Colusa County and the 4 nearest county-level areas by centroid distance, with the California average for scale.
AreaAverage daily trafficTruck shareDaily vehicle-milesAverage travel timeCongestion ratio
Colusa County3,19121.1%1,487,58839.5 min10.1%
Sutter County, California6,4538.8%2,634,83332.6 min15.3%
Lake County, California6,1597.4%1,447,76638.4 min19.1%
Glenn County, California2,80319.2%1,075,54233.3 min11.7%
Yolo County, California6,49911.8%5,669,59433.4 min17.9%
California average12,7667.8%N/A34.5 min27.4%

Colusa County ranked within California

Colusa County sits in California's top three on truck share on highways.

Colusa County ranked among 58 county-level areas in California (1 = highest); measures without data in every county rank a smaller field, down to 52.
MeasureColusa CountyCalifornia rank
Traffic volume (AADT)3,191#49 of 58
Highway vehicle-miles per day1,256,518#39 of 52
Truck share on highways23.4%#3 of 52
Highway trucks per day2,263#29 of 52
Average travel time39.5 min#7 of 58
Average driver income$79,838#39 of 58
Average driver age45.0 yrs#29 of 58

The two ends of this table sit far apart: #3 of 52 on truck share on highways, against #49 of 58 on average daily traffic volume.

Busiest roads in Colusa County, California

The three busiest roads in Colusa County average 18,532 vehicles a day, 5.8 times the county average of 3,191 across all its monitored roads.

Side Highway leads with 28,943 vehicles a day, 7,381 of them trucks (25.5%). No other road comes close: Bridge Street, in second place, carries 13,485. It tops the truck ranking too, with the most trucks.

Side Highway carries longer journeys than most roads here, with a median trip of 69.4 minutes against 39.5 county-wide.

Market Street is busy with cars rather than freight: only 9.8% of its traffic is trucks, against 21.1% county-wide.

Ranked by daily traffic (AADT)

Cars and light vehiclesTrucks
1Side HighwayMotorway · 28,943vehicles7,381trucks · 25.5%
Road class
Motorway
Congestion ratio
32.9%
Median trip time
69.4 min
Drivers’ median age
46.0 yrs
Drivers’ average income
$80,043

Travel on Side Highway's busiest stretch runs 33% over free-flow time, against 10% across the county, so expect slower peak hours.

2Bridge StreetTrunk road · 13,485vehicles1,329trucks · 9.9%
Road class
Trunk road
Congestion ratio
39.7%
Median trip time
33.9 min
Drivers’ median age
45.2 yrs
Drivers’ average income
$90,396

Bridge Street is one of the more congested roads here: trips take 40% longer than at free-flow speed, against 10% county-wide.

3Market StreetTrunk road · 13,167vehicles1,284trucks · 9.8%
Road class
Trunk road
Congestion ratio
20.3%
Median trip time
37.4 min
Drivers’ median age
45.3 yrs
Drivers’ average income
$88,773

On its busiest stretch, Market Street carries 4.1 times the county average; trucks are 9.8% of it, below the county-wide 21.1%.

4CA 20 / CA 45Trunk road · 9,823vehicles923trucks · 9.4%
Road class
Trunk road
Congestion ratio
25.2%
Median trip time
37.1 min
Drivers’ median age
45.5 yrs
Drivers’ average income
$87,090

CA 20 / CA 45 peaks at 9,823 vehicles a day, 3.1 times the county average; trucks are 9.4% of it, below the county-wide 21.1%.

5CA 20Trunk road · 9,223vehicles984trucks · 10.7%
Road class
Trunk road
Congestion ratio
14.4%
Median trip time
40.6 min
Drivers’ median age
46.2 yrs
Drivers’ average income
$80,928

CA 20 carries 2.9 times the county average at its busiest, 984 of them trucks (10.7%, below the county-wide 21.1%).

Ranked by trucks per day

Cars and light vehiclesTrucks
1Side HighwayMotorway · #1 by traffic28,943vehicles7,381trucks · 25.5%
2Bridge StreetTrunk road · #2 by traffic13,485vehicles1,329trucks · 9.9%
3Market StreetTrunk road · #3 by traffic13,167vehicles1,284trucks · 9.8%
4CA 20Trunk road · #5 by traffic9,223vehicles984trucks · 10.7%
5CA 20 / CA 45Trunk road · #4 by traffic9,823vehicles923trucks · 9.4%
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

ColusaDepartment 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 Colusa County

The same traffic breakdown for the areas closest to Colusa County, California.

Need segment-level traffic data?

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