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Traffic heat map of Clark County, South Dakota: 141 miles of roads shaded from blue (light) to red (heavy traffic), busiest on 1st Avenue and 173rd Street

Clark County, South Dakota Traffic Counts

The average road here carries 775 vehicles a day, 75% less than the South Dakota average of 3,156. This page breaks down traffic in Clark County, South Dakota across 141 miles of monitored roads split into 372 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 Clark County, South Dakota

Traffic

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

vehicles per day775
Trucks

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

9.4%
Average travel time

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

48.3 min
Drivers’ average age

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

52.5 yrs
Drivers’ average income

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

$64,864

The average monitored road in Clark County, South Dakota carries 775 vehicles per day. Across its 141 miles of monitored roads, that adds up to 107,865 vehicle-miles traveled per day (≈39.4 million per year). About 1 in 11 vehicles is a truck, in line with South Dakota (10.3%).

Traffic 75% below the South Dakota average

At 775 vehicles per day, the average monitored road in Clark carries 75% less traffic than the state average of 3,156, suggesting less demand on each road - very light roads: easy truck access, but little passing trade for roadside retail. Network-wide, Clark accounts for about 0.4% of South Dakota's statewide total of vehicle-miles. By volume, Clark's 775 vehicles per day trails 77% of counties in South Dakota.

Journey times run 49% higher than the state level, at 48.3 minutes on average. 86% of counties in South Dakota have a shorter average travel time than Clark's 48.3 minutes.

Time-of-Day & Seasonal Patterns

Data Finding: Hourly & Seasonal Patterns

In Clark County, South Dakota, the peak hour concentrates about 8% of the day's traffic.

Clark County vs. South Dakota Traffic Comparison

Clark County's biggest difference from the South Dakota average is its average daily traffic per road, 75% below it. Its average travel time, by contrast, is 49% above.

MetricClark CountySouth Dakota averageDifference
Traffic7753,156-75.4%
Truck % (Total Traffic)9.4%10.3%-8.1%
Avg. Travel Time48.3 min32.5 min+48.8%

How Clark County compares

Clark County moves the least traffic of its nearby counties

Set against the average of the 4 areas nearest to it, Clark County carries 62.7% less traffic on a typical road and moves 28.2% of the total daily travel; it has the quietest roads of the five. Quiet roads and long journeys - a rural pattern, where the distance between destinations rather than the traffic on the way is what takes the time.

Clark County and the 4 nearest county-level areas by centroid distance, with the South Dakota average for scale.
AreaAverage daily trafficTruck shareDaily vehicle-milesAverage travel timeCongestion ratio
Clark County7759.4%107,86548.3 minN/A
Codington County, South Dakota5,1667.5%858,24433.9 minN/A
Spink County, South Dakota1,18210.9%267,16237.9 minN/A
Day County, South Dakota95111.2%204,38542.5 minN/A
Hamlin County, South Dakota1,01710.2%198,30634.6 minN/A
South Dakota average3,15610.3%N/A32.5 min12.9%

Clark County ranked within South Dakota

Clark County sits in the top quarter of the South Dakota field on average travel time, at #10 of 66.

Clark County ranked among 66 county-level areas in South Dakota (1 = highest).
MeasureClark CountySouth Dakota rank
Traffic volume (AADT)775#51 of 66
Average travel time48.3 min#10 of 66
Average driver income$64,864#47 of 66
Average driver age52.5 yrs#19 of 66

Clark County ranks #10 of 66 on average travel time but #51 of 66 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 Clark County, South Dakota

The three busiest roads in Clark County average 1,971 vehicles a day, 2.5 times the county average of 775 across all its monitored roads.

1st Avenue leads with 2,318 vehicles a day, 218 of them trucks (9.4%). 173rd Street carries the most trucks, 230 a day (10.3% of its traffic), although it ranks #2 for all traffic.

Ranked by daily traffic (AADT)

Cars and light vehiclesTrucks
11st AvenuePrimary road · 2,318vehicles218trucks · 9.4%
Road class
Primary road
Median trip time
45.8 min
Drivers’ median age
54.9 yrs
Drivers’ average income
$60,886

On its busiest stretch, 1st Avenue carries 3.0 times the county average; trucks are 9.4% of it, in line with the county-wide 9.4%.

2173rd StreetPrimary road · 2,230vehicles230trucks · 10.3%
Road class
Primary road
Median trip time
44.9 min
Drivers’ median age
52.0 yrs
Drivers’ average income
$62,319

173rd Street peaks at 2,230 vehicles a day, 2.9 times the county average; trucks are 10.3% of it, above the county-wide 9.4%.

3SD Highway 20Primary road · 1,365vehicles134trucks · 9.9%
Road class
Primary road
Median trip time
46.8 min
Drivers’ median age
51.2 yrs
Drivers’ average income
$71,719

SD Highway 20 is busy by local standards, at 76% more than the county average on its busiest stretch; trucks are 9.9% of it, in line with the county-wide 9.4%.

4158th StreetPrimary road · 1,276vehicles123trucks · 9.6%
Road class
Primary road
Median trip time
45.1 min
Drivers’ median age
50.6 yrs
Drivers’ average income
$71,713

158th Street peaks at 1,276 vehicles a day, 65% more than the county average; trucks are 9.6% of it, in line with the county-wide 9.4%.

5US 212Primary road · 1,264vehicles142trucks · 11.2%
Road class
Primary road
Median trip time
53.4 min
Drivers’ median age
53.3 yrs
Drivers’ average income
$67,237

US 212 carries 63% more than the county average at its busiest, 142 of them trucks (11.2%, above the county-wide 9.4%).

Ranked by trucks per day

Cars and light vehiclesTrucks
1173rd StreetPrimary road · #2 by traffic2,230vehicles230trucks · 10.3%
21st AvenuePrimary road · #1 by traffic2,318vehicles218trucks · 9.4%
3US 212Primary road · #5 by traffic1,264vehicles142trucks · 11.2%
4SD Highway 20Primary road · #3 by traffic1,365vehicles134trucks · 9.9%
5158th StreetPrimary road · #4 by traffic1,276vehicles123trucks · 9.6%
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

ClarkDepartment 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 Clark County

The same traffic breakdown for the areas closest to Clark County, South Dakota.

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