This map shows modeled outdoor noise across Smith River 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 290 Smith River residents, or 16.6%, live above that level. By land area, 16.0% of Smith River is above 55 dBA.
See how noise in Smith River compares to similar-sized cities.
Noise by Part of Smith River
Average noise levels for Smith River residents, grouped by direction from the center of Smith River. Central Smith River carries the highest population-weighted average; Southern Smith River carries the lowest. Just 0% of residents in Southern Smith River live in blocks above the EPA's 55 dBA threshold, a fifth of the share in Central Smith River.
Central Smith River
16% of people above 55 dBA
Eastern Smith River
32% of people above 55 dBA
Northern Smith River
12% of people above 55 dBA
Southern Smith River
0% of people above 55 dBA
Western Smith River
6% of people above 55 dBA
Central Smith River sounds about 150% louder than Southern Smith River to the human ear, a 13.2 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.
How far back from do you need to be?
produces an estimated 69 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 20% of Smith River sits under tree canopy (lighter than most cities) and roughly 18% 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.