Noise Levels in Slabtown, Portland, OR | Find Quiet Neighborhoods With Our Sound Map
58 dBA
Average noise across Slabtown
Normal conversation an arm’s length away
1,923
Residents above the EPA 55 dBA threshold
63% of Slabtown residents
81 dBA
Loudest residential point
Food blender at arm’s length
This map shows modeled outdoor noise across Slabtown 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 1,923 Slabtown residents, or 62.8%, live above that level. By land area, 82.1% of Slabtown is above 55 dBA.
Average noise levels for Slabtown residents, grouped by direction from the center of Slabtown. Southern Slabtown carries the highest population-weighted average; Western Slabtown carries the lowest. Just 12% of residents in Western Slabtown live in blocks above the EPA's 55 dBA threshold, a fifth of the share in Southern Slabtown.
Central Slabtown
57.8 dBA · Moderate-loud
Normal conversation an arm’s length away
60% of people above 55 dBA
QuietLoud
Eastern Slabtown
60.8 dBA · Loud
Normal conversation an arm’s length away
100% of people above 55 dBA
QuietLoud
Northern Slabtown
60.1 dBA · Loud
Normal conversation an arm’s length away
80% of people above 55 dBA
QuietLoud
Southern Slabtown
62.1 dBA · Loud
Busy restaurant
100% of people above 55 dBA
QuietLoud
Western Slabtown
50.8 dBA · Moderate
Quiet office
12% of people above 55 dBA
QuietLoud
Southern Slabtown sounds about 119% louder than Western Slabtown to the human ear, a 11.3 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 30 do you need to be?
US Route 30 produces an estimated 76 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
76 dBA
City bus interior
165 ft
61 dBA
Busy restaurant
330 ft
53 dBA
Quiet office to normal conversation
660 ft
44 dBA
Quiet suburban street at night
¼ mile
36 dBA
Soft rainfall
½ mile
35 dBA
Soft rainfall
Calculated from the model's calibrated attenuation formula. About 6% of Slabtown sits under tree canopy (lighter than most neighborhoods) and roughly 83% 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 Slabtown. 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.
Airport Noise
Portland International (PDX) sits northeast of Slabtown. 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 65 dBA on the map's Overall layer. Blocks on the opposite side of Slabtown, particularly to the southwest, show no measurable aviation contribution. Use the Aviation toggle on the map above to isolate the airport's footprint.
How Noise Is Distributed Across Slabtown
The bar chart below shows the share of Slabtown residents in each noise band. About 24% of residents live below the EPA's 55 dBA threshold, and roughly 32% live in blocks above 60 dBA. Long-term exposure in that range is linked to elevated stress hormones and cardiovascular risk.
How Slabtown Compares
Slabtown sits at the louder end of the spectrum. Below: how Slabtown's average outdoor noise and share of residents above the EPA threshold compare with Homestead, Old Town-Chinatown, Brooklyn, and Garden Home-Raleigh Hills.
Average noise level (dBA)
Slabtown's 57.9 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 Slabtown because most of either area is rural land away from major roads.
Share of residents above 55 dBA
About 62.8% of Slabtown 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, 82.1% of Slabtown'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 Slabtown
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 30 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 6% of Slabtown is under tree cover (lighter than most neighborhoods), and the dominant land cover is high-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 northeast. Neighborhoods to the southwest 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.
