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Traffic heat map of Custer County, Idaho: 122 miles of roads shaded from blue (light) to red (heavy traffic), busiest on US 93 and Custer Street

Custer County, Idaho Traffic Counts

Traffic analytics for Custer County, Idaho, calculated from real-world mobile and sensor networks on 759 road segments (122 road miles, about 852 ft each). Its drivers are the oldest of any county in Idaho, a median 60 years. 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
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Total Traffic Volume & Performance in Custer County, Idaho

Traffic

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

vehicles per day1,141
Trucks

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

10.7%
Average travel time

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

31.3 min
Drivers’ average age

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

59.7 yrs
Drivers’ average income

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

$52,883

Our data shows 1,141 vehicles per day on the average road in Custer County, Idaho, and 92,311 vehicle-miles traveled per day (≈33.7 million per year) across its 122 miles of monitored roads. About 1 in 9 vehicles is a truck, in line with Idaho (9.7%).

Quieter roads than 93% of counties in Idaho

Custer's average daily traffic volume is 80% lower than the state average - 1,141 vehicles per day against 5,734 - suggesting less traffic load per road - quiet roads that suit freight movement more than drive-by retail. Network-wide, Custer accounts for about 0.2% of Idaho's statewide total of vehicle-miles. Custer carries less traffic than 93% of counties in Idaho.

Journey times run 8% lower than the state level, at 31.3 minutes on average. Its average travel time of 31.3 minutes is shorter than 65% of counties in Idaho.

Time-of-Day & Seasonal Patterns

peak hours icon
Peak Traffic Windows
Weekday peaks:
AM peak 10:00 AM–12:00 PM and PM peak 3:00 PM–6:00 PM, with volumes reaching approximately 84% higher than the daily average.
Weekend traffic:
Weekend traffic is about as busy as on weekdays (-4%): leisure and through trips largely replace the commute.
seasonal traffic icon
Seasonal Fluctuation
Busy season:
June–August is the high season, with volumes +63% versus the annual average.
Lowest month:
January is the quietest month, with volumes -53% versus the annual average - the usual winter low.

Data Finding: Hourly & Seasonal Patterns

In Custer County, Idaho, the peak hour concentrates about 8% of the day's traffic, and there is a strong seasonal swing of +63% in high season.

Custer County vs. Idaho Traffic Comparison

The average daily traffic per road sets Custer County apart: 80% below the Idaho average.

MetricCuster CountyIdaho averageDifference
Traffic1,1415,734-80.1%
Truck % (Total Traffic)10.7%9.7%+10.4%
Avg. Travel Time31.3 min33.8 min-7.6%

How Custer County compares

Custer County against nearby counties

Set against the average of the 4 areas nearest to it, Custer County carries 55.8% less traffic on a typical road and moves 36.2% of the total daily travel; it has the fourth busiest roads of the five. Smaller and quieter on both counts: a shorter network than the areas around it, carrying lighter traffic across it.

Custer 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
Custer County1,14110.7%92,31131.3 minN/A
Lemhi County, Idaho2,4319.1%127,81329.5 minN/A
Camas County, Idaho1,0959.6%64,34252.6 minN/A
Blaine County, Idaho4,7147.2%572,28529.9 minN/A
Butte County, Idaho2,09011.2%255,69840.9 minN/A
Idaho average5,7349.7%N/A33.8 min16.0%

Custer County ranked within Idaho

On average driver age, Custer County tops the Idaho field outright.

Custer County ranked among 44 county-level areas in Idaho (1 = highest).
MeasureCuster CountyIdaho rank
Traffic volume (AADT)1,141#41 of 44
Average travel time31.3 min#29 of 44
Average driver income$52,883#42 of 44
Average driver age59.7 yrs#1 of 44

Custer County ranks #1 of 44 on average driver age but #42 of 44 on average driver income. The driver population here skews older and lower-income than most of Idaho.

Busiest roads in Custer County, Idaho

Traffic concentrates on a few corridors: the three busiest roads average 2,351 vehicles a day, against 1,141 on the average road in Custer County.

US 93 leads with 2,929 vehicles a day, 221 of them trucks (7.5%). It also carries the most trucks.

Trucks make up 52.5% of traffic on Grand View Canyon Road, against 10.7% across all roads in the county.

Eva Falls Avenue draws drivers from wealthier areas: their neighborhoods average $78,811 in household income, 49% above the county's $52,883, while those on Grand View Canyon Road average $37,708, 29% below it.

Trips on Eva Falls Avenue are short, a median of 14.1 minutes against 31.3 county-wide, so it serves mostly local traffic.

Ranked by daily traffic (AADT)

Cars and light vehiclesTrucks
1US 93Primary road · 2,929vehicles221trucks · 7.5%
Road class
Primary road
Median trip time
33.2 min
Drivers’ median age
61.6 yrs
Drivers’ average income
$46,727

US 93 carries 2.6 times the county average on its busiest stretch, where the median trip lasts 33.2 minutes.

2Custer StreetPrimary road · 2,658vehicles171trucks · 6.4%
Road class
Primary road
Median trip time
32.6 min
Drivers’ median age
57.1 yrs
Drivers’ average income
$57,023

At 2.3 times the county average, Custer Street draws drivers from neighborhoods averaging $57,023 in household income.

3Main StreetTertiary road · 1,466vehicles89trucks · 6.1%
Road class
Tertiary road
Median trip time
39.1 min
Drivers’ median age
61.9 yrs
Drivers’ average income
$46,916

At 28% more than the county average, Main Street draws drivers from neighborhoods averaging $46,916 in household income.

4Eva Falls AvenuePrimary road · 730vehicles55trucks · 7.6%
Road class
Primary road
Median trip time
14.1 min
Drivers’ median age
65.9 yrs
Drivers’ average income
$78,811

Eva Falls Avenue is a quieter road: its busiest stretch carries 36% less than the county average; trucks are 7.6% of it, below the county-wide 10.7%.

5ID 21Primary road · 559vehicles44trucks · 8.0%
Road class
Primary road
Median trip time
14.8 min
Drivers’ median age
65.9 yrs
Drivers’ average income
$78,811

ID 21 is a local road at heart: the median trip using it lasts 14.8 minutes, against 31.3 for the county.

Ranked by trucks per day

Cars and light vehiclesTrucks
1US 93Primary road · #1 by traffic2,929vehicles221trucks · 7.5%
2Custer StreetPrimary road · #2 by traffic2,658vehicles171trucks · 6.4%
3Grand View Canyon RoadPrimary road · 200vehicles105trucks · 52.5%
Road class
Primary road
Median trip time
34.7 min
Drivers’ median age
58.4 yrs
Drivers’ average income
$37,708

Even at its busiest, Grand View Canyon Road carries 82% less than the county average; trucks are 52.5% of it, above the county-wide 10.7%.

4Main StreetTertiary road · #3 by traffic1,466vehicles89trucks · 6.1%
5Eva Falls AvenuePrimary road · #4 by traffic730vehicles55trucks · 7.6%
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

CusterDepartment 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 Custer County

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

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