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Traffic heat map of Dewey County, South Dakota: 177 miles of roads shaded from blue (light) to red (heavy traffic), busiest on D Street and Main Street

Dewey County, South Dakota Traffic Counts

Our Dewey County, South Dakota traffic data covers 506 road segments over 177 road miles, with an average segment of just 1,852 ft. Its busiest road, D Street, carries 3,470 vehicles a day, 4.0 times the average road. Whether you are evaluating a new retail location, planning routes or assessing infrastructure, these numbers replace guesswork.
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 Dewey County, South Dakota

Traffic

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

vehicles per day863
Trucks

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

13.1%
Average travel time

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

39.8 min
Drivers’ average age

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

41.0 yrs
Drivers’ average income

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

$54,947

A typical monitored road in Dewey County, South Dakota sees 863 vehicles per day, while its 177 miles of monitored roads together handle 59,014 vehicle-miles traveled per day (≈21.5 million per year). Trucks are 13.1% of traffic, more than the 10.3% across South Dakota.

Traffic 73% below the South Dakota average

Dewey sees 73% lower average daily traffic volume than the state average (863 vehicles per day against 3,156), suggesting less demand on each road - very light roads: easy truck access, but little passing trade for roadside retail. In total volume terms, its road network carries about 0.2% of South Dakota's statewide total of vehicle-miles. By volume, Dewey's 863 vehicles per day trails 66% of counties in South Dakota.

Journey times run 23% higher than the state level, at 39.8 minutes on average. 66% of counties in South Dakota have a shorter average travel time than Dewey's 39.8 minutes.

Time-of-Day & Seasonal Patterns

Data Finding: Hourly & Seasonal Patterns

In Dewey County, South Dakota, the peak hour concentrates about 7% of the day's traffic.

Dewey County vs. South Dakota Traffic Comparison

Dewey County's biggest difference from the South Dakota average is its average daily traffic per road, 73% below it. Its truck share, by contrast, is 27% above.

MetricDewey CountySouth Dakota averageDifference
Traffic8633,156-72.7%
Truck % (Total Traffic)13.1%10.3%+27.3%
Avg. Travel Time39.8 min32.5 min+22.6%

How Dewey County compares

Dewey County against nearby counties

Dewey County tracks the 4 areas around it closely - no measure in this table sets it far apart from the areas immediately next to it, though it has the second busiest roads of the five.

Dewey 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
Dewey County86313.1%59,01439.8 minN/A
Ziebach County, South Dakota49513.2%37,66253.0 minN/A
Stanley County, South Dakota2,32312.2%159,78440.2 minN/A
Sully County, South Dakota69713.4%50,79135.8 minN/A
Potter County, South Dakota63112.4%62,43835.0 minN/A
South Dakota average3,15610.3%N/A32.5 min12.9%

Dewey County ranked within South Dakota

Dewey County sits in the bottom quarter of the South Dakota field on average driver income, at #63 of 66.

Dewey County ranked among 66 county-level areas in South Dakota (1 = highest).
MeasureDewey CountySouth Dakota rank
Traffic volume (AADT)863#44 of 66
Average travel time39.8 min#23 of 66
Average driver income$54,947#63 of 66
Average driver age41.0 yrs#62 of 66

The two ends of this table sit far apart: #23 of 66 on average travel time, against #63 of 66 on average driver income.

Busiest roads in Dewey County, South Dakota

Traffic concentrates on a few corridors: the three busiest roads average 2,450 vehicles a day, against 863 on the average road in Dewey County.

D Street is the busiest road, at 3,470 vehicles a day, 325 of them trucks (9.4%). It also carries the most trucks.

Few trucks use Main Street: 5.8% of its traffic, under half the county's 13.1%.

Ranked by daily traffic (AADT)

Cars and light vehiclesTrucks
1D StreetTertiary road · 3,470vehicles325trucks · 9.4%
Road class
Tertiary road
Median trip time
38.7 min
Drivers’ median age
40.7 yrs
Drivers’ average income
$61,853

D Street carries 4.0 times the county average at its busiest, 325 of them trucks (9.4%, below the county-wide 13.1%).

2Main StreetTertiary road · 2,917vehicles170trucks · 5.8%
Road class
Tertiary road
Median trip time
37.6 min
Drivers’ median age
41.1 yrs
Drivers’ average income
$54,048

Main Street carries 3.4 times the county average on its busiest stretch, where the median trip lasts 37.6 minutes.

3SD 63Primary road · 962vehicles104trucks · 10.8%
Road class
Primary road
Median trip time
44.7 min
Drivers’ median age
40.9 yrs
Drivers’ average income
$49,386

SD 63 is busy by local standards, at 11% more than the county average on its busiest stretch; trucks are 10.8% of it, below the county-wide 13.1%.

4US 212Primary road · 891vehicles93trucks · 10.4%
Road class
Primary road
Median trip time
46.6 min
Drivers’ median age
41.2 yrs
Drivers’ average income
$50,281

Even at its busiest, US 212 carries about the same as the county average; trucks are 10.4% of it, below the county-wide 13.1%.

5SD Highway 20Primary road · 579vehicles66trucks · 11.4%
Road class
Primary road
Median trip time
38.7 min
Drivers’ median age
42.6 yrs
Drivers’ average income
$63,936

SD Highway 20 is a quieter road: its busiest stretch carries 33% less than the county average; trucks are 11.4% of it, below the county-wide 13.1%.

Ranked by trucks per day

Cars and light vehiclesTrucks
1D StreetTertiary road · #1 by traffic3,470vehicles325trucks · 9.4%
2Main StreetTertiary road · #2 by traffic2,917vehicles170trucks · 5.8%
3SD 63Primary road · #3 by traffic962vehicles104trucks · 10.8%
4US 212Primary road · #4 by traffic891vehicles93trucks · 10.4%
5SD Highway 20Primary road · #5 by traffic579vehicles66trucks · 11.4%
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

DeweyDepartment 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 Dewey County

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

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