Need segment-level traffic data?

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

Get insights →
Traffic heat map of Lemhi County, Idaho: 118 miles of roads shaded from blue (light) to red (heavy traffic), busiest on Main Street and Challis Street

Lemhi County, Idaho Traffic Counts

Traffic analytics for Lemhi County, Idaho, calculated from real-world mobile and sensor networks on 503 road segments (118 road miles, about 1,241 ft each). Its busiest road, Main Street, carries 8,028 vehicles a day, 3.3 times the average road. Use the figures below to move from assumptions to certainty on retail locations, logistics and road planning.
Data sourced from TrafficZoom's proprietary analytics platform.
Data current as of:
Q3 2026
Updated:
September 29, 2026
Find my place
total traffic icon

Total Traffic Volume & Performance in Lemhi County, Idaho

Traffic

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

vehicles per day2,431
Trucks

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

9.1%
Average travel time

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

29.5 min
Drivers’ average age

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

57.0 yrs
Drivers’ average income

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

$52,508

Our data shows 2,431 vehicles per day on the average road in Lemhi County, Idaho, and 127,813 vehicle-miles traveled per day (≈46.7 million per year) across its 118 miles of monitored roads. About 1 in 11 vehicles is a truck, in line with Idaho (9.7%).

Shorter trips than 88% of counties in Idaho

At 2,431 vehicles per day, the average monitored road in Lemhi carries 58% less traffic than the state average of 5,734, suggesting less demand on each road - quiet roads that suit freight movement more than drive-by retail. Network-wide, Lemhi accounts for about 0.3% of Idaho's statewide total of vehicle-miles. 63% of counties in Idaho see more traffic than Lemhi's 2,431 vehicles per day.

At 29.5 minutes, the average travel time is 13% lower than the state level. On travel time, Lemhi runs shorter than 88% of counties in Idaho.

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 12:00 PM–2:00 PM, with volumes reaching approximately 74% higher than the daily average.
Weekend traffic:
Weekends are somewhat quieter: volumes run about 7% below weekday levels, the usual weekend dip.
seasonal traffic icon
Seasonal Fluctuation
Busy season:
July–September is the high season, with volumes +31% versus the annual average.
Lowest month:
January is the quietest month, with volumes -32% versus the annual average - the usual winter low.

Data Finding: Hourly & Seasonal Patterns

In Lemhi County, Idaho, the peak hour concentrates about 7% of the day's traffic, and there is a strong seasonal swing of +31% in high season.

Lemhi County vs. Idaho Traffic Comparison

Lemhi County's biggest difference from the Idaho average is its average daily traffic per road, 58% below it.

MetricLemhi CountyIdaho averageDifference
Traffic2,4315,734-57.6%
Truck % (Total Traffic)9.1%9.7%-5.9%
Avg. Travel Time29.5 min33.8 min-12.9%

How Lemhi County compares

Lemhi County against nearby counties

Set against the average of the 4 areas nearest to it, Lemhi County moves 30.6% of the total daily travel; it has the third busiest roads of the five. The same kind of road, just less of it: traffic per road matches the areas around it while the network itself is smaller.

Lemhi County and the 4 nearest county-level areas by centroid distance, with the Idaho average for scale.
AreaAverage daily trafficTruck shareDaily vehicle-milesAverage travel timeCongestion ratio
Lemhi County2,4319.1%127,81329.5 minN/A
Beaverhead County, Montana1,64315.9%448,60635.2 min6.5%
Custer County, Idaho1,14110.7%92,31131.3 minN/A
Ravalli County, Montana4,6856.2%709,40431.9 min10.1%
Valley County, Idaho3,7807.5%421,43823.3 min9.7%
Idaho average5,7349.7%N/A33.8 min16.0%

Lemhi County ranked within Idaho

Lemhi County sits in Idaho's top three on average driver age.

Lemhi County ranked among 44 county-level areas in Idaho (1 = highest).
MeasureLemhi CountyIdaho rank
Traffic volume (AADT)2,431#28 of 44
Average travel time29.5 min#39 of 44
Average driver income$52,508#43 of 44
Average driver age57.0 yrs#3 of 44

Lemhi County ranks #3 of 44 on average driver age but #43 of 44 on average driver income. The driver population here skews older and lower-income than most of Idaho.

Busiest roads in Lemhi County, Idaho

Traffic concentrates on a few corridors: the three busiest roads average 5,552 vehicles a day, against 2,431 on the average road in Lemhi County.

Main Street leads with 8,028 vehicles a day, 530 of them trucks (6.6%). It tops the truck ranking too, with the most trucks.

Drivers on Lewis and Clark Trail come from neighborhoods with an average household income of $34,717, 34% below the county average of $52,508.

Trips on Lewis and Clark Trail are short, a median of 19.2 minutes against 29.5 county-wide, so it serves mostly local traffic.

Ranked by daily traffic (AADT)

Cars and light vehiclesTrucks
1Main StreetPrimary road · 8,028vehicles530trucks · 6.6%
Road class
Primary road
Median trip time
29.5 min
Drivers’ median age
56.7 yrs
Drivers’ average income
$49,900

Main Street carries 3.3 times the county average at its busiest, 530 of them trucks (6.6%, below the county-wide 9.1%).

2Challis StreetPrimary road · 5,647vehicles329trucks · 5.8%
Road class
Primary road
Median trip time
24.0 min
Drivers’ median age
57.6 yrs
Drivers’ average income
$50,164

Challis Street carries 2.3 times the county average on its busiest stretch, where the median trip lasts 24.0 minutes.

3US 93Primary road · 2,981vehicles236trucks · 7.9%
Road class
Primary road
Median trip time
28.1 min
Drivers’ median age
57.1 yrs
Drivers’ average income
$45,411

US 93 is busy by local standards, at 23% more than the county average on its busiest stretch; trucks are 7.9% of it, below the county-wide 9.1%.

4Lewis and Clark TrailPrimary road · 1,189vehicles138trucks · 11.6%
Road class
Primary road
Median trip time
19.2 min
Drivers’ median age
54.7 yrs
Drivers’ average income
$34,717

Even at its busiest, Lewis and Clark Trail carries 51% less than the county average; trucks are 11.6% of it, above the county-wide 9.1%.

5ID 28Primary road · 1,097vehicles100trucks · 9.1%
Road class
Primary road
Median trip time
24.1 min
Drivers’ median age
56.9 yrs
Drivers’ average income
$58,693

ID 28 is a quieter road: its busiest stretch carries 55% less than the county average; trucks are 9.1% of it, in line with the county-wide 9.1%.

Ranked by trucks per day

Cars and light vehiclesTrucks
1Main StreetPrimary road · #1 by traffic8,028vehicles530trucks · 6.6%
2Challis StreetPrimary road · #2 by traffic5,647vehicles329trucks · 5.8%
3US 93Primary road · #3 by traffic2,981vehicles236trucks · 7.9%
4Lewis and Clark TrailPrimary road · #4 by traffic1,189vehicles138trucks · 11.6%
5ID 28Primary road · #5 by traffic1,097vehicles100trucks · 9.1%
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

LemhiDepartment 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.
link arrow icon
Data current as of:
Q3 2026

Explore further

TrafficZoom platform

— street-level analytics and custom corridor reports.

Map AI

— demographics, housing and mobility data.

Counties near Lemhi County

The same traffic breakdown for the areas closest to Lemhi County, Idaho.

Need segment-level traffic data?

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