Noise Levels in Gresham-North Central, Gresham, OR | Find Quiet Neighborhoods With Our Sound Map
56 dBA
Average noise across Gresham-North Central
Normal conversation an arm’s length away
3,400
Residents above the EPA 55 dBA threshold
42% of Gresham-North Central residents
69 dBA
Loudest residential point
Highway traffic 50 ft away
This map shows modeled outdoor noise across Gresham-North Central 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
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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 3,400 Gresham-North Central residents, or 42.4%, live above that level. By land area, 47.4% of Gresham-North Central is above 55 dBA.
Average noise levels for Gresham-North Central residents, grouped by direction from the center of Gresham-North Central. Southern Gresham-North Central carries the highest population-weighted average; Northern Gresham-North Central carries the lowest. Just 39% of residents in Northern Gresham-North Central live in blocks above the EPA's 55 dBA threshold, three-quarters of the share in Southern Gresham-North Central.
Central Gresham-North Central
56.4 dBA · Moderate-loud
Normal conversation an arm’s length away
51% of people above 55 dBA
QuietLoud
Eastern Gresham-North Central
56.9 dBA · Moderate-loud
Normal conversation an arm’s length away
44% of people above 55 dBA
QuietLoud
Northern Gresham-North Central
55.2 dBA · Moderate-loud
Quiet office to normal conversation
39% of people above 55 dBA
QuietLoud
Southern Gresham-North Central
57.0 dBA · Moderate-loud
Normal conversation an arm’s length away
48% of people above 55 dBA
QuietLoud
Western Gresham-North Central
55.7 dBA · Moderate-loud
Quiet office to normal conversation
34% of people above 55 dBA
QuietLoud
Southern Gresham-North Central sounds about 13% louder than Northern Gresham-North Central to the human ear, a 1.8 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.
At source
69 dBA
Highway traffic 50 ft away
165 ft
55 dBA
Quiet office to normal conversation
330 ft
47 dBA
Quiet office
660 ft
38 dBA
Soft rainfall
¼ mile
35 dBA
Soft rainfall
½ mile
35 dBA
Soft rainfall
Calculated from the model's calibrated attenuation formula. About 30% of Gresham-North Central sits under tree canopy (heavier than most neighborhoods) and roughly 54% 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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Airport Noise
Portland International (PDX) sits northwest of Gresham-North Central. The U.S. Department of Transportation models aviation noise around this airport from federal traffic data, and the model uses those federal measurements rather than synthetic predictions.
Blocks under the approach and departure paths carry combined road-plus-aviation noise, with some exceeding 45 dBA on the map's Overall layer. Blocks on the opposite side of Gresham-North Central, particularly to the southeast, show no measurable aviation contribution. Use the Aviation toggle on the map above to isolate the airport's footprint.
How Noise Is Distributed Across Gresham-North Central
The bar chart below shows the share of Gresham-North Central residents in each noise band. About 39% of residents live below the EPA's 55 dBA threshold, and roughly 6% live in blocks above 60 dBA. Long-term exposure in that range is linked to elevated stress hormones and cardiovascular risk.
How Gresham-North Central Compares
Gresham-North Central sits at the louder end of the spectrum. Below: how Gresham-North Central's average outdoor noise and share of residents above the EPA threshold compare with Argay, Gresham-Northwest, Mill Park, and Mount Tabor.
Average noise level (dBA)
Gresham-North Central's 56.3 dBA pop-weighted average is at the louder end of the spectrum. Oregon as a whole averages 52.9 dBA and the U.S. averages 52.0 dBA. Both are lower than Gresham-North Central because most of either area is rural land away from major roads.
Share of residents above 55 dBA
About 42.4% of Gresham-North Central 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, 47.4% of Gresham-North Central'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 Gresham-North Central
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 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 30% of Gresham-North Central is under tree cover (heavier than most neighborhoods), and the dominant land cover is medium-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.
Airport noise is directional. Portland International's approach paths concentrate aviation noise to the northwest. Neighborhoods to the southeast of downtown show no measurable contribution from the airport.
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.
