This map shows modeled outdoor noise across Dewey County at 100-meter resolution, combining road, aviation, and rail sources. Green areas measure below 45 dBA. Orange and red exceed the EPA's 55 dBA outdoor threshold linked to long-term health effects. Use the layer toggles to view each source on its own or all together.
What the numbers sound like
- 30 dBAWhisper
- 40 dBASoft rainfall
- 45 dBAQuiet suburban street at night
- 50 dBAQuiet office
- 55 dBAEPA outdoor threshold: light traffic 100 ft away
- 60 dBANormal conversation an arm's length away
- 65 dBABusy restaurant
- 70 dBAHighway traffic 50 ft away
- 80 dBACity bus interior
Population Above the EPA Outdoor Threshold
The EPA's 55 dBA outdoor reference level is a common benchmark for residential noise exposure, especially for activity interference, annoyance, and long-term community noise concerns. About 1,408 Dewey County residents, or 29.6%, live above that level. By land area, 19.2% of Dewey County is above 55 dBA.
See how noise in Dewey County compares to similar-sized counties.
Noise by Part of Dewey County
Average noise levels for Dewey County residents, grouped by direction from the center of Dewey County. Southern Dewey County carries the highest population-weighted average; Eastern Dewey County carries the lowest. Just 7% of residents in Eastern Dewey County live in blocks above the EPA's 55 dBA threshold, a fifth of the share in Southern Dewey County.
Eastern Dewey County
7% of people above 55 dBA
Northern Dewey County
22% of people above 55 dBA
Southern Dewey County
43% of people above 55 dBA
Western Dewey County
4% of people above 55 dBA
Southern Dewey County sounds about 133% louder than Eastern Dewey County to the human ear, a 12.2 dBA gap. Every 10 dBA roughly doubles perceived loudness. Within any of these directions, two homes a quarter mile apart can still differ by 10 or more dBA depending on how close they sit to a major highway.
Loudest Road Corridors
The model evaluates every road in Dewey County using federal traffic counts, posted speeds, heavy-truck ratios, and pavement type. The source level shown is the modeled noise at the road centerline, where it is loudest. Noise drops with distance, faster in vegetated areas and slower over open pavement.
How far back from 136 St do you need to be?
136 St produces an estimated 59 dBA at its loudest centerline points. Noise drops logarithmically with distance, with the exact rate depending on what's between you and the road. Tree cover, walls, terrain, and pavement type all matter. At roughly a quarter mile back, traffic fades into the noise level of a soft rainfall.
Calculated from the model's calibrated attenuation formula. About 0% of Dewey County sits under tree canopy (much lighter than most counties) and roughly 23% is impervious surface like pavement and rooftops. Both are folded into the per-place decay rate above. Heavier canopy pulls noise down faster with distance; impervious surfaces slow the drop.
How Noise Is Distributed Across Dewey County
The bar chart below shows the share of Dewey County residents in each noise band. About 64% of residents live below the EPA's 55 dBA threshold, and roughly 5% live in blocks above 60 dBA. Long-term exposure in that range is linked to elevated stress hormones and cardiovascular risk.
How Dewey County Compares
Dewey County sits at the quieter end of the spectrum. Below: how Dewey County's average outdoor noise and share of residents above the EPA threshold compare with Ziebach County, Walworth County, Corson County, and Stanley County.
Average noise level (dBA)
Dewey County's 48.1 dBA pop-weighted average is at the quieter end of the spectrum. South Dakota as a whole averages 52.6 dBA and the U.S. averages 52.0 dBA. Both are lower than Dewey County because most of either area is rural land away from major roads.
Share of residents above 55 dBA
About 29.6% of Dewey County residents live in blocks where outdoor levels exceed the EPA's 55 dBA threshold. That's in the middle of its peer group. Measured by land area instead, 19.2% of Dewey County's footprint sits above 55 dBA, against a South Dakota average of 20.8% and a national average of 28.1%.
What This Means if You're Moving to Dewey County
- Distance from highways matters more than the neighborhood name. Two homes in the same zip code can differ by 20 dBA if one sits 100 meters from 136 St and the other 500 meters away. The model captures this at 100-meter resolution, so noise exposure changes block by block.
- Tree canopy can help reduce modeled noise exposure. Roughly 0% of Dewey County is under tree cover (much lighter than most counties), and the dominant land cover is low-intensity developed land. Both are measured from federal USDA Forest Service and USGS satellite imagery at 30-meter resolution. Streets with 60% or higher canopy show 3 to 5 dBA lower noise than comparable streets with bare ground or pavement, which is why the per-place decay rate above already accounts for it.
Sources & Methodology
The BestNeighborhood noise model is calibrated against nearly one million federal ground-truth measurements across four states. Road noise is computed from segment-level federal traffic data and propagated outward using physics-based acoustic decay, with attenuation rates that depend on the surrounding land cover.
Federal datasets used:
FHWA Highway Performance Monitoring System: road geometry, traffic counts, lane configuration
U.S. DoT Bureau of Transportation Statistics National Transportation Noise Map: aviation and rail noise, road calibration ground truth
USGS / MRLC National Land Cover Database: land cover and impervious surface coverage
USDA Forest Service Tree Canopy Cover: vegetation density for sound propagation
U.S. Census Bureau TIGER/Line: block-level geography and population
U.S. EPA Levels Document: 55 dBA outdoor reference level
All inputs are published federal datasets. Block-level noise is computed by combining road, rail, and aviation sound sources in the energy domain, the same physics used in professional environmental noise assessments. Read the full methodology.