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Traffic heat map of San Juan County, Washington: 95 miles of roads shaded from blue (light) to red (heavy traffic), busiest on Tucker Avenue and Main Street

San Juan County, Washington Traffic Counts

How busy are the roads of San Juan County, Washington? We measure 95 road miles, divided into 2,246 segments, with multi-sourced, cross-verified mobile and sensor data. Its roads are the quietest of any county in Washington, at 797 vehicles a day on average. 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 San Juan County, Washington

Traffic

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

vehicles per day797
Trucks

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

6.3%
Average travel time

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

34.4 min
Drivers’ average age

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

57.8 yrs
Drivers’ average income

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

$84,223

The average monitored road in San Juan County, Washington carries 797 vehicles per day. Across its 95 miles of monitored roads, that adds up to 74,151 vehicle-miles traveled per day (≈27.1 million per year). About 1 in 16 vehicles is a truck, in line with Washington (7.1%).

The quietest roads of any county in Washington

San Juan's average daily traffic volume is 89% lower than the state average - 797 vehicles per day against 7,322 - 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 less than 0.1% of Washington's statewide total of vehicle-miles. In fact, San Juan has the lowest average traffic volume of any county in Washington, at 797 vehicles per day.

At 34.4 minutes, the average travel time matches the state level closely. 63% of counties in Washington have a shorter average travel time than San Juan's 34.4 minutes.

Time-of-Day & Seasonal Patterns

Data Finding: Hourly & Seasonal Patterns

In San Juan County, Washington, the peak hour concentrates about 8% of the day's traffic.

San Juan County vs. Washington Traffic Comparison

Of the four measures, average daily traffic per road differs most: San Juan County runs 89% below the Washington average.

MetricSan Juan CountyWashington averageDifference
Traffic7977,322-89.1%
Truck % (Total Traffic)6.3%7.1%-11.7%
Avg. Travel Time34.4 min33.2 min+3.7%

How San Juan County compares

San Juan County moves the least traffic of its nearby counties

Against the 4 nearest areas, San Juan County moves 2.9% of the total daily travel and carries 84.6% less traffic on a typical road; it has the quietest roads of the five. Smaller and quieter on both counts: a shorter network than the areas around it, carrying lighter traffic across it.

San Juan County and the 4 nearest county-level areas by centroid distance, with the Washington average for scale.
AreaAverage daily trafficTruck shareDaily vehicle-milesAverage travel timeCongestion ratio
San Juan County7976.3%74,15134.4 minN/A
Island County, Washington3,5735.4%1,028,96533.9 min15.2%
Skagit County, Washington5,3077.6%3,814,19331.9 min17.0%
Whatcom County, Washington6,6426.1%3,927,26229.9 min19.5%
Clallam County, Washington5,2046.3%1,337,87833.8 min16.0%
Washington average7,3227.1%N/A33.2 min19.9%

San Juan County ranked within Washington

No county-level area in Washington records a lower average daily traffic volume than San Juan County.

San Juan County ranked among 39 county-level areas in Washington (1 = highest).
MeasureSan Juan CountyWashington rank
Traffic volume (AADT)797#39 of 39
Average travel time34.4 min#15 of 39
Average driver income$84,223#15 of 39
Average driver age57.8 yrs#5 of 39

San Juan County ranks #5 of 39 on average driver age but #39 of 39 on average daily traffic volume - the two describe the same roads and are worth reading together rather than either on its own.

Busiest roads in San Juan County, Washington

On their busiest stretches, the three busiest roads in San Juan County carry 2,754 vehicles a day on average, 3.5 times the typical road in the county (797).

Tucker Avenue leads with 2,924 vehicles a day, 176 of them trucks (6.0%). It tops the truck ranking too, with the most trucks.

Lover's Lane carries longer journeys than most roads here, with a median trip of 94.3 minutes against 34.4 county-wide.

Ranked by daily traffic (AADT)

Cars and light vehiclesTrucks
1Tucker AvenueSecondary road · 2,924vehicles176trucks · 6.0%
Road class
Secondary road
Median trip time
50.8 min
Drivers’ median age
57.0 yrs
Drivers’ average income
$80,088

Tucker Avenue carries through traffic: the median trip using it lasts 50.8 minutes, against 34.4 for the county.

2Main StreetTertiary road · 2,690vehicles133trucks · 5.0%
Road class
Tertiary road
Median trip time
63.2 min
Drivers’ median age
58.6 yrs
Drivers’ average income
$75,476

Drivers on Main Street are on long journeys, a median 63.2 minutes against 34.4 county-wide: a through route more than a local street.

3Crescent Beach DriveTertiary road · 2,648vehicles148trucks · 5.6%
Road class
Tertiary road
Median trip time
31.5 min
Drivers’ median age
57.5 yrs
Drivers’ average income
$77,737

Crescent Beach Drive peaks at 2,648 vehicles a day, 3.3 times the county average; trucks are 5.6% of it, below the county-wide 6.3%.

4Lover's LaneSecondary road · 2,182vehicles126trucks · 5.8%
Road class
Secondary road
Median trip time
94.3 min
Drivers’ median age
57.2 yrs
Drivers’ average income
$72,224

Lover's Lane carries 2.7 times the county average at its busiest, 126 of them trucks (5.8%, below the county-wide 6.3%).

5Guard StreetSecondary road · 2,056vehicles113trucks · 5.5%
Road class
Secondary road
Median trip time
36.7 min
Drivers’ median age
57.5 yrs
Drivers’ average income
$83,253

Guard Street carries 2.6 times the county average on its busiest stretch, where the median trip lasts 36.7 minutes.

Ranked by trucks per day

Cars and light vehiclesTrucks
1Tucker AvenueSecondary road · #1 by traffic2,924vehicles176trucks · 6.0%
2Crescent Beach DriveTertiary road · #3 by traffic2,648vehicles148trucks · 5.6%
3Main StreetTertiary road · #2 by traffic2,690vehicles133trucks · 5.0%
4Lover's LaneSecondary road · #4 by traffic2,182vehicles126trucks · 5.8%
5Guard StreetSecondary road · #5 by traffic2,056vehicles113trucks · 5.5%
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

San JuanDepartment 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 San Juan County

The same traffic breakdown for the areas closest to San Juan County, Washington.

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