Noise Levels in Grass Valley, OR | Find Quiet Neighborhoods With Our Sound Map
48 dBA
Average noise across Grass Valley
Quiet office
91
Residents above the EPA 55 dBA threshold
31% of Grass Valley residents
77 dBA
Loudest residential point
City bus interior
This map shows modeled outdoor noise across Grass Valley 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.
Overall
Road
Rail
Aviation
Click the map to explore
35 dBa55 dBa (EPA limit)90+ dBa
3545557090
Quietest (dBA)Loudest
Colorblind friendlyoff
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 91 Grass Valley residents, or 31.1%, live above that level. By land area, 21.4% of Grass Valley is above 55 dBA.
Average noise levels for Grass Valley residents, grouped by direction from the center of Grass Valley. Northern Grass Valley carries the highest population-weighted average; Western Grass Valley carries the lowest. Just 9% of residents in Western Grass Valley live in blocks above the EPA's 55 dBA threshold, a third of the share in Northern Grass Valley.
Eastern Grass Valley
41.6 dBA · Quiet
Quiet suburban street at night
1% of people above 55 dBA
QuietLoud
Northern Grass Valley
52.4 dBA · Moderate
Quiet office to normal conversation
43% of people above 55 dBA
QuietLoud
Southern Grass Valley
43.2 dBA · Quiet
Quiet suburban street at night
24% of people above 55 dBA
QuietLoud
Western Grass Valley
40.3 dBA · Quiet
Soft rainfall
9% of people above 55 dBA
QuietLoud
Northern Grass Valley sounds about 131% louder than Western Grass Valley to the human ear, a 12.1 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 US Route 97 do you need to be?
US Route 97 produces an estimated 64 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.
At source
64 dBA
Busy restaurant
165 ft
52 dBA
Quiet office to normal conversation
330 ft
44 dBA
Quiet suburban street at night
660 ft
37 dBA
Soft rainfall
¼ mile
35 dBA
Soft rainfall
½ mile
35 dBA
Soft rainfall
Calculated from the model's calibrated attenuation formula. About 2% of Grass Valley sits under tree canopy (much lighter than most cities) and roughly 8% 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.
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Rail Noise
Active freight rail runs through parts of Grass Valley. For most blocks the rail-only contribution is small. Combined road-plus-rail noise rarely exceeds road noise on its own. The exceptions are the handful of blocks within roughly a quarter mile of the right-of-way during pass-through hours.
Use the Rail toggle on the map above to isolate rail's contribution from road and aviation.
How Noise Is Distributed Across Grass Valley
The bar chart below shows the share of Grass Valley residents in each noise band. About 71% of residents live below the EPA's 55 dBA threshold, and roughly 2% live in blocks above 60 dBA. Long-term exposure in that range is linked to elevated stress hormones and cardiovascular risk.
How Grass Valley Compares
Grass Valley sits at the quieter end of the spectrum. Below: how Grass Valley's average outdoor noise and share of residents above the EPA threshold compare with Moro, Rufus, Friend, and Kent.
Average noise level (dBA)
Grass Valley's 48.0 dBA pop-weighted average is at the quieter end of the spectrum. Oregon as a whole averages 52.9 dBA and the U.S. averages 52.0 dBA. Both are lower than Grass Valley because most of either area is rural land away from major roads.
Share of residents above 55 dBA
About 31.1% of Grass Valley residents live in blocks where outdoor levels exceed the EPA's 55 dBA threshold. That's more than any of its peer group. Measured by land area instead, 21.4% of Grass Valley's footprint sits above 55 dBA, against a Oregon average of 24.2% and a national average of 28.1%.
What This Means if You're Moving to Grass Valley
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 US Route 97 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 2% of Grass Valley is under tree cover (much lighter than most cities), and the dominant land cover is grassland. 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.
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.
